Anatomically Correct Mesopelagic Aves The Next CEO of Stack OverflowPlanet of the Aves: AquabirdsAnatomically Correct HecatoncheiresAnatomically Correct MurlocsAnatomically correct furryAnatomically Correct AhuizotlAnatomically correct vampiresAnatomically correct akanameAnatomically Correct TrollsAnatomically correct ghoulsAnatomically correct GoronAnatomically correct radio communication

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Anatomically Correct Mesopelagic Aves



The Next CEO of Stack OverflowPlanet of the Aves: AquabirdsAnatomically Correct HecatoncheiresAnatomically Correct MurlocsAnatomically correct furryAnatomically Correct AhuizotlAnatomically correct vampiresAnatomically correct akanameAnatomically Correct TrollsAnatomically correct ghoulsAnatomically correct GoronAnatomically correct radio communication










9












$begingroup$


Recently I had a vision of a colossal underwater bird-like figure.



I would describe it as follows:



  • Roughly the wingspan of the length of a blue whale

  • Snow-white

  • Typical shape and feathering of a bird of prey (I may have mistaken something else for feathers)

  • Gliding into the depth, probably in the mesopelagic/twilight zone

Since such a creature couldn't possibly be an actual bird, unlike the aqua-bird, what is my giant mid-sea bird?










share|improve this question











$endgroup$







  • 1




    $begingroup$
    The wingspan of a blue whale... in the length or in the breadth of the whale?
    $endgroup$
    – L.Dutch
    2 days ago






  • 1




    $begingroup$
    @L.Dutch The wingspan of the creature is roughly the length of a blue whale.
    $endgroup$
    – A Lambent Eye
    2 days ago










  • $begingroup$
    @cobaltduck The light may have tricked my eye into thinking they were feathers...
    $endgroup$
    – A Lambent Eye
    2 days ago






  • 2




    $begingroup$
    "During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
    $endgroup$
    – AlexP
    2 days ago











  • $begingroup$
    @JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
    $endgroup$
    – A Lambent Eye
    yesterday















9












$begingroup$


Recently I had a vision of a colossal underwater bird-like figure.



I would describe it as follows:



  • Roughly the wingspan of the length of a blue whale

  • Snow-white

  • Typical shape and feathering of a bird of prey (I may have mistaken something else for feathers)

  • Gliding into the depth, probably in the mesopelagic/twilight zone

Since such a creature couldn't possibly be an actual bird, unlike the aqua-bird, what is my giant mid-sea bird?










share|improve this question











$endgroup$







  • 1




    $begingroup$
    The wingspan of a blue whale... in the length or in the breadth of the whale?
    $endgroup$
    – L.Dutch
    2 days ago






  • 1




    $begingroup$
    @L.Dutch The wingspan of the creature is roughly the length of a blue whale.
    $endgroup$
    – A Lambent Eye
    2 days ago










  • $begingroup$
    @cobaltduck The light may have tricked my eye into thinking they were feathers...
    $endgroup$
    – A Lambent Eye
    2 days ago






  • 2




    $begingroup$
    "During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
    $endgroup$
    – AlexP
    2 days ago











  • $begingroup$
    @JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
    $endgroup$
    – A Lambent Eye
    yesterday













9












9








9





$begingroup$


Recently I had a vision of a colossal underwater bird-like figure.



I would describe it as follows:



  • Roughly the wingspan of the length of a blue whale

  • Snow-white

  • Typical shape and feathering of a bird of prey (I may have mistaken something else for feathers)

  • Gliding into the depth, probably in the mesopelagic/twilight zone

Since such a creature couldn't possibly be an actual bird, unlike the aqua-bird, what is my giant mid-sea bird?










share|improve this question











$endgroup$




Recently I had a vision of a colossal underwater bird-like figure.



I would describe it as follows:



  • Roughly the wingspan of the length of a blue whale

  • Snow-white

  • Typical shape and feathering of a bird of prey (I may have mistaken something else for feathers)

  • Gliding into the depth, probably in the mesopelagic/twilight zone

Since such a creature couldn't possibly be an actual bird, unlike the aqua-bird, what is my giant mid-sea bird?







creature-design sea-creatures anatomically-correct






share|improve this question















share|improve this question













share|improve this question




share|improve this question








edited 2 days ago







A Lambent Eye

















asked 2 days ago









A Lambent EyeA Lambent Eye

1,771732




1,771732







  • 1




    $begingroup$
    The wingspan of a blue whale... in the length or in the breadth of the whale?
    $endgroup$
    – L.Dutch
    2 days ago






  • 1




    $begingroup$
    @L.Dutch The wingspan of the creature is roughly the length of a blue whale.
    $endgroup$
    – A Lambent Eye
    2 days ago










  • $begingroup$
    @cobaltduck The light may have tricked my eye into thinking they were feathers...
    $endgroup$
    – A Lambent Eye
    2 days ago






  • 2




    $begingroup$
    "During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
    $endgroup$
    – AlexP
    2 days ago











  • $begingroup$
    @JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
    $endgroup$
    – A Lambent Eye
    yesterday












  • 1




    $begingroup$
    The wingspan of a blue whale... in the length or in the breadth of the whale?
    $endgroup$
    – L.Dutch
    2 days ago






  • 1




    $begingroup$
    @L.Dutch The wingspan of the creature is roughly the length of a blue whale.
    $endgroup$
    – A Lambent Eye
    2 days ago










  • $begingroup$
    @cobaltduck The light may have tricked my eye into thinking they were feathers...
    $endgroup$
    – A Lambent Eye
    2 days ago






  • 2




    $begingroup$
    "During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
    $endgroup$
    – AlexP
    2 days ago











  • $begingroup$
    @JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
    $endgroup$
    – A Lambent Eye
    yesterday







1




1




$begingroup$
The wingspan of a blue whale... in the length or in the breadth of the whale?
$endgroup$
– L.Dutch
2 days ago




$begingroup$
The wingspan of a blue whale... in the length or in the breadth of the whale?
$endgroup$
– L.Dutch
2 days ago




1




1




$begingroup$
@L.Dutch The wingspan of the creature is roughly the length of a blue whale.
$endgroup$
– A Lambent Eye
2 days ago




$begingroup$
@L.Dutch The wingspan of the creature is roughly the length of a blue whale.
$endgroup$
– A Lambent Eye
2 days ago












$begingroup$
@cobaltduck The light may have tricked my eye into thinking they were feathers...
$endgroup$
– A Lambent Eye
2 days ago




$begingroup$
@cobaltduck The light may have tricked my eye into thinking they were feathers...
$endgroup$
– A Lambent Eye
2 days ago




2




2




$begingroup$
"During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
$endgroup$
– AlexP
2 days ago





$begingroup$
"During the Late Eocene and the Early Oligocene (40–30 mya), some lineages of gigantic penguins existed. Nordenskjoeld's giant penguin (Anthropornis nordenskjoeldi) was the tallest, growing nearly 1.80 meters (5.9 feet) tall. The New Zealand giant penguin (Pachydyptes ponderosus) was probably the heaviest, weighing 80 kg or more. Both were found on New Zealand, the former also in the Antarctic farther eastwards." (Wikipedia, s.v. Pinguin)
$endgroup$
– AlexP
2 days ago













$begingroup$
@JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
$endgroup$
– A Lambent Eye
yesterday




$begingroup$
@JBH I'm not sure, would it fit? The other entries of the anatomically correct series are 'real' creatures, whereas this is entire 'fictional' and 'unique'. If you deem it acceptable I will add it.
$endgroup$
– A Lambent Eye
yesterday










4 Answers
4






active

oldest

votes


















9












$begingroup$

Let's start with something in the Real World (TM), then try to see whether we can manipulate its future evolution into your creature. The thing I have in mind is the humble gannet, birds of the Morus genus. As seen in this article at Media Drum World, when these birds feed, they spend quite a bit of time swimming to a bit of depth, and do so quite adeptly.



enter image description here



We begin with two-out-of-four of your features already in place: Snow-white, and typical shape and feathering of a bird of prey. We just need to figure out how to grow it much, much larger, and get it to abandon its life in the skies and greatly increase its diving depth. How? The usual evolutionary pressures: eat, don't get eaten, make more of your kind (i.e. sex).



As the fish dive deeper to escape, the mega-gannet must follow. But now the sharks, which already compete with the gannet at the bait ball, have a better chance to pick them off along side the fish. Time to get larger, too large for a shark to swallow. This will eventually make it too large to fly. Alongside this, the mega-gannet will probably become swifter at swimming. I'm uncertain whether the mega-gannet might develop a blubber layer, or if feathers can adapt to provide cold-water protection (penguins, for example, have both). Finally, those mega-gannet which are most successful at eating and not getting eaten will also be more successful at breeding, and these traits will augment in each generation.



Given the right circumstances and a few million years, anything can happen.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
    $endgroup$
    – Sonvar
    2 days ago


















8












$begingroup$

It's for sure the notorious Pinguinus Humongous.



It's a descendant from penguins, which, instead of feeding on small fishes, decided to go big and hunt for dolphins and other large sea mammals.



Its size is necessary for hunting those preys, and the feathers come from its ancestors being birds adapted to the sea environment.






share|improve this answer











$endgroup$








  • 1




    $begingroup$
    Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
    $endgroup$
    – AlexP
    2 days ago











  • $begingroup$
    Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
    $endgroup$
    – A Lambent Eye
    yesterday










  • $begingroup$
    @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
    $endgroup$
    – L.Dutch
    yesterday


















5












$begingroup$

Except for the feathers, your creature is rather like a manta ray: https://en.wikipedia.org/wiki/Manta_ray



So convergent evolution is your friend here. Just as the demands of hydrodynamics cause sharks, tuna, dolphins, and ichthyosaurs to all look much the same to a casual eye, your mesopelagic bird is descended from penguins that evolved into occupying the same environmental niche as manta.






share|improve this answer









$endgroup$




















    4












    $begingroup$

    Giant nudibranch.



    nudibranch
    source



    These are ocean animals. They swim slowly along as I imagine your creature might. They can have a vaguely avian outline as seen here.



    Known nudibranchs of course do not get to the size you want, but maybe they could. The molluscan body plan can scale up. Squids get big.






    share|improve this answer









    $endgroup$












    • $begingroup$
      What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
      $endgroup$
      – A Lambent Eye
      yesterday






    • 1




      $begingroup$
      1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
      $endgroup$
      – Willk
      yesterday











    • $begingroup$
      As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
      $endgroup$
      – cobaltduck
      yesterday











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    4 Answers
    4






    active

    oldest

    votes








    4 Answers
    4






    active

    oldest

    votes









    active

    oldest

    votes






    active

    oldest

    votes









    9












    $begingroup$

    Let's start with something in the Real World (TM), then try to see whether we can manipulate its future evolution into your creature. The thing I have in mind is the humble gannet, birds of the Morus genus. As seen in this article at Media Drum World, when these birds feed, they spend quite a bit of time swimming to a bit of depth, and do so quite adeptly.



    enter image description here



    We begin with two-out-of-four of your features already in place: Snow-white, and typical shape and feathering of a bird of prey. We just need to figure out how to grow it much, much larger, and get it to abandon its life in the skies and greatly increase its diving depth. How? The usual evolutionary pressures: eat, don't get eaten, make more of your kind (i.e. sex).



    As the fish dive deeper to escape, the mega-gannet must follow. But now the sharks, which already compete with the gannet at the bait ball, have a better chance to pick them off along side the fish. Time to get larger, too large for a shark to swallow. This will eventually make it too large to fly. Alongside this, the mega-gannet will probably become swifter at swimming. I'm uncertain whether the mega-gannet might develop a blubber layer, or if feathers can adapt to provide cold-water protection (penguins, for example, have both). Finally, those mega-gannet which are most successful at eating and not getting eaten will also be more successful at breeding, and these traits will augment in each generation.



    Given the right circumstances and a few million years, anything can happen.






    share|improve this answer











    $endgroup$








    • 1




      $begingroup$
      change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
      $endgroup$
      – Sonvar
      2 days ago















    9












    $begingroup$

    Let's start with something in the Real World (TM), then try to see whether we can manipulate its future evolution into your creature. The thing I have in mind is the humble gannet, birds of the Morus genus. As seen in this article at Media Drum World, when these birds feed, they spend quite a bit of time swimming to a bit of depth, and do so quite adeptly.



    enter image description here



    We begin with two-out-of-four of your features already in place: Snow-white, and typical shape and feathering of a bird of prey. We just need to figure out how to grow it much, much larger, and get it to abandon its life in the skies and greatly increase its diving depth. How? The usual evolutionary pressures: eat, don't get eaten, make more of your kind (i.e. sex).



    As the fish dive deeper to escape, the mega-gannet must follow. But now the sharks, which already compete with the gannet at the bait ball, have a better chance to pick them off along side the fish. Time to get larger, too large for a shark to swallow. This will eventually make it too large to fly. Alongside this, the mega-gannet will probably become swifter at swimming. I'm uncertain whether the mega-gannet might develop a blubber layer, or if feathers can adapt to provide cold-water protection (penguins, for example, have both). Finally, those mega-gannet which are most successful at eating and not getting eaten will also be more successful at breeding, and these traits will augment in each generation.



    Given the right circumstances and a few million years, anything can happen.






    share|improve this answer











    $endgroup$








    • 1




      $begingroup$
      change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
      $endgroup$
      – Sonvar
      2 days ago













    9












    9








    9





    $begingroup$

    Let's start with something in the Real World (TM), then try to see whether we can manipulate its future evolution into your creature. The thing I have in mind is the humble gannet, birds of the Morus genus. As seen in this article at Media Drum World, when these birds feed, they spend quite a bit of time swimming to a bit of depth, and do so quite adeptly.



    enter image description here



    We begin with two-out-of-four of your features already in place: Snow-white, and typical shape and feathering of a bird of prey. We just need to figure out how to grow it much, much larger, and get it to abandon its life in the skies and greatly increase its diving depth. How? The usual evolutionary pressures: eat, don't get eaten, make more of your kind (i.e. sex).



    As the fish dive deeper to escape, the mega-gannet must follow. But now the sharks, which already compete with the gannet at the bait ball, have a better chance to pick them off along side the fish. Time to get larger, too large for a shark to swallow. This will eventually make it too large to fly. Alongside this, the mega-gannet will probably become swifter at swimming. I'm uncertain whether the mega-gannet might develop a blubber layer, or if feathers can adapt to provide cold-water protection (penguins, for example, have both). Finally, those mega-gannet which are most successful at eating and not getting eaten will also be more successful at breeding, and these traits will augment in each generation.



    Given the right circumstances and a few million years, anything can happen.






    share|improve this answer











    $endgroup$



    Let's start with something in the Real World (TM), then try to see whether we can manipulate its future evolution into your creature. The thing I have in mind is the humble gannet, birds of the Morus genus. As seen in this article at Media Drum World, when these birds feed, they spend quite a bit of time swimming to a bit of depth, and do so quite adeptly.



    enter image description here



    We begin with two-out-of-four of your features already in place: Snow-white, and typical shape and feathering of a bird of prey. We just need to figure out how to grow it much, much larger, and get it to abandon its life in the skies and greatly increase its diving depth. How? The usual evolutionary pressures: eat, don't get eaten, make more of your kind (i.e. sex).



    As the fish dive deeper to escape, the mega-gannet must follow. But now the sharks, which already compete with the gannet at the bait ball, have a better chance to pick them off along side the fish. Time to get larger, too large for a shark to swallow. This will eventually make it too large to fly. Alongside this, the mega-gannet will probably become swifter at swimming. I'm uncertain whether the mega-gannet might develop a blubber layer, or if feathers can adapt to provide cold-water protection (penguins, for example, have both). Finally, those mega-gannet which are most successful at eating and not getting eaten will also be more successful at breeding, and these traits will augment in each generation.



    Given the right circumstances and a few million years, anything can happen.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 2 days ago

























    answered 2 days ago









    cobaltduckcobaltduck

    7,5962150




    7,5962150







    • 1




      $begingroup$
      change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
      $endgroup$
      – Sonvar
      2 days ago












    • 1




      $begingroup$
      change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
      $endgroup$
      – Sonvar
      2 days ago







    1




    1




    $begingroup$
    change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
    $endgroup$
    – Sonvar
    2 days ago




    $begingroup$
    change in bone density and muscular structure. The change in medium the bird moves through would require different physiological changes. Penguins and chickens have a higher bone density, so its not unheard of for that adaptation to occur in birds.
    $endgroup$
    – Sonvar
    2 days ago











    8












    $begingroup$

    It's for sure the notorious Pinguinus Humongous.



    It's a descendant from penguins, which, instead of feeding on small fishes, decided to go big and hunt for dolphins and other large sea mammals.



    Its size is necessary for hunting those preys, and the feathers come from its ancestors being birds adapted to the sea environment.






    share|improve this answer











    $endgroup$








    • 1




      $begingroup$
      Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
      $endgroup$
      – AlexP
      2 days ago











    • $begingroup$
      Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
      $endgroup$
      – A Lambent Eye
      yesterday










    • $begingroup$
      @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
      $endgroup$
      – L.Dutch
      yesterday















    8












    $begingroup$

    It's for sure the notorious Pinguinus Humongous.



    It's a descendant from penguins, which, instead of feeding on small fishes, decided to go big and hunt for dolphins and other large sea mammals.



    Its size is necessary for hunting those preys, and the feathers come from its ancestors being birds adapted to the sea environment.






    share|improve this answer











    $endgroup$








    • 1




      $begingroup$
      Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
      $endgroup$
      – AlexP
      2 days ago











    • $begingroup$
      Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
      $endgroup$
      – A Lambent Eye
      yesterday










    • $begingroup$
      @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
      $endgroup$
      – L.Dutch
      yesterday













    8












    8








    8





    $begingroup$

    It's for sure the notorious Pinguinus Humongous.



    It's a descendant from penguins, which, instead of feeding on small fishes, decided to go big and hunt for dolphins and other large sea mammals.



    Its size is necessary for hunting those preys, and the feathers come from its ancestors being birds adapted to the sea environment.






    share|improve this answer











    $endgroup$



    It's for sure the notorious Pinguinus Humongous.



    It's a descendant from penguins, which, instead of feeding on small fishes, decided to go big and hunt for dolphins and other large sea mammals.



    Its size is necessary for hunting those preys, and the feathers come from its ancestors being birds adapted to the sea environment.







    share|improve this answer














    share|improve this answer



    share|improve this answer








    edited 2 days ago

























    answered 2 days ago









    L.DutchL.Dutch

    89.4k29208434




    89.4k29208434







    • 1




      $begingroup$
      Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
      $endgroup$
      – AlexP
      2 days ago











    • $begingroup$
      Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
      $endgroup$
      – A Lambent Eye
      yesterday










    • $begingroup$
      @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
      $endgroup$
      – L.Dutch
      yesterday












    • 1




      $begingroup$
      Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
      $endgroup$
      – AlexP
      2 days ago











    • $begingroup$
      Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
      $endgroup$
      – A Lambent Eye
      yesterday










    • $begingroup$
      @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
      $endgroup$
      – L.Dutch
      yesterday







    1




    1




    $begingroup$
    Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
    $endgroup$
    – AlexP
    2 days ago





    $begingroup$
    Pinguinus, not Penguinus. And they are auks, not penguins. Otherwise it's fine. If you want penguins, that would likely be a descendant of Anthropornis, possibly Dinanthropornis colossicus.
    $endgroup$
    – AlexP
    2 days ago













    $begingroup$
    Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
    $endgroup$
    – A Lambent Eye
    yesterday




    $begingroup$
    Penguins don't tend to have a large wingspan, nor are the feathers particulary visible, or am I mistaken?
    $endgroup$
    – A Lambent Eye
    yesterday












    $begingroup$
    @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
    $endgroup$
    – L.Dutch
    yesterday




    $begingroup$
    @ALambentEye, if you want to be streamlined underwater you cannot afford fluffy feathers and the resulting drag, especially if you rely on velocity to chase your meal
    $endgroup$
    – L.Dutch
    yesterday











    5












    $begingroup$

    Except for the feathers, your creature is rather like a manta ray: https://en.wikipedia.org/wiki/Manta_ray



    So convergent evolution is your friend here. Just as the demands of hydrodynamics cause sharks, tuna, dolphins, and ichthyosaurs to all look much the same to a casual eye, your mesopelagic bird is descended from penguins that evolved into occupying the same environmental niche as manta.






    share|improve this answer









    $endgroup$

















      5












      $begingroup$

      Except for the feathers, your creature is rather like a manta ray: https://en.wikipedia.org/wiki/Manta_ray



      So convergent evolution is your friend here. Just as the demands of hydrodynamics cause sharks, tuna, dolphins, and ichthyosaurs to all look much the same to a casual eye, your mesopelagic bird is descended from penguins that evolved into occupying the same environmental niche as manta.






      share|improve this answer









      $endgroup$















        5












        5








        5





        $begingroup$

        Except for the feathers, your creature is rather like a manta ray: https://en.wikipedia.org/wiki/Manta_ray



        So convergent evolution is your friend here. Just as the demands of hydrodynamics cause sharks, tuna, dolphins, and ichthyosaurs to all look much the same to a casual eye, your mesopelagic bird is descended from penguins that evolved into occupying the same environmental niche as manta.






        share|improve this answer









        $endgroup$



        Except for the feathers, your creature is rather like a manta ray: https://en.wikipedia.org/wiki/Manta_ray



        So convergent evolution is your friend here. Just as the demands of hydrodynamics cause sharks, tuna, dolphins, and ichthyosaurs to all look much the same to a casual eye, your mesopelagic bird is descended from penguins that evolved into occupying the same environmental niche as manta.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered 2 days ago









        jamesqfjamesqf

        10.4k11937




        10.4k11937





















            4












            $begingroup$

            Giant nudibranch.



            nudibranch
            source



            These are ocean animals. They swim slowly along as I imagine your creature might. They can have a vaguely avian outline as seen here.



            Known nudibranchs of course do not get to the size you want, but maybe they could. The molluscan body plan can scale up. Squids get big.






            share|improve this answer









            $endgroup$












            • $begingroup$
              What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
              $endgroup$
              – A Lambent Eye
              yesterday






            • 1




              $begingroup$
              1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
              $endgroup$
              – Willk
              yesterday











            • $begingroup$
              As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
              $endgroup$
              – cobaltduck
              yesterday















            4












            $begingroup$

            Giant nudibranch.



            nudibranch
            source



            These are ocean animals. They swim slowly along as I imagine your creature might. They can have a vaguely avian outline as seen here.



            Known nudibranchs of course do not get to the size you want, but maybe they could. The molluscan body plan can scale up. Squids get big.






            share|improve this answer









            $endgroup$












            • $begingroup$
              What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
              $endgroup$
              – A Lambent Eye
              yesterday






            • 1




              $begingroup$
              1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
              $endgroup$
              – Willk
              yesterday











            • $begingroup$
              As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
              $endgroup$
              – cobaltduck
              yesterday













            4












            4








            4





            $begingroup$

            Giant nudibranch.



            nudibranch
            source



            These are ocean animals. They swim slowly along as I imagine your creature might. They can have a vaguely avian outline as seen here.



            Known nudibranchs of course do not get to the size you want, but maybe they could. The molluscan body plan can scale up. Squids get big.






            share|improve this answer









            $endgroup$



            Giant nudibranch.



            nudibranch
            source



            These are ocean animals. They swim slowly along as I imagine your creature might. They can have a vaguely avian outline as seen here.



            Known nudibranchs of course do not get to the size you want, but maybe they could. The molluscan body plan can scale up. Squids get big.







            share|improve this answer












            share|improve this answer



            share|improve this answer










            answered 2 days ago









            WillkWillk

            115k27218483




            115k27218483











            • $begingroup$
              What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
              $endgroup$
              – A Lambent Eye
              yesterday






            • 1




              $begingroup$
              1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
              $endgroup$
              – Willk
              yesterday











            • $begingroup$
              As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
              $endgroup$
              – cobaltduck
              yesterday
















            • $begingroup$
              What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
              $endgroup$
              – A Lambent Eye
              yesterday






            • 1




              $begingroup$
              1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
              $endgroup$
              – Willk
              yesterday











            • $begingroup$
              As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
              $endgroup$
              – cobaltduck
              yesterday















            $begingroup$
            What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
            $endgroup$
            – A Lambent Eye
            yesterday




            $begingroup$
            What an intersting creature! Why might it change colour and become larger, or what would cause it to do so?
            $endgroup$
            – A Lambent Eye
            yesterday




            1




            1




            $begingroup$
            1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
            $endgroup$
            – Willk
            yesterday





            $begingroup$
            1. Color - you could assert that default color for a mollusk is silvery white. Your creature is not trying to camouflage and it is not signaling to conspecifics with color so it is the default slug color 2. Something this big is probably a filter feeder like the whales and largest sharks. Size is an advantage for filter feeding and probably the bigger the better because you can filter more. An ancestor got into the filter feeding business and evolution scaled it up with time.
            $endgroup$
            – Willk
            yesterday













            $begingroup$
            As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
            $endgroup$
            – cobaltduck
            yesterday




            $begingroup$
            As regard the scaling up - the typical Blue Sea Angel is as long as a human finger is wide. From less than an inch (~25mm) to nearly a thousand inches (~80 feet, ~25m) is a lot of scaling. Not saying it's impossible, just making it clear the magnitude in question. (+1 by the way)
            $endgroup$
            – cobaltduck
            yesterday

















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