Terne
One thing that amuses me a bit is the over use of wings on characters, without tails. Without the tails flight would be clusmy, if at all possible (even flying squirrels use their tails in flight/gliding).
Additionally the wings are the wrong size; either increadibly large or little midget wings which look rediculous, it just proves the wings are there for the sake of being cool, not for flight or a justifiable part of the character, etc. Lastly there are the whole busty girls who are pathetically skinny with wings (where is the
muscule, essential for flight?)
Ooooh kind of a rant, but my point's in there, somewhere.
gonk
To quote Ragetti from Pirates of the Caribbean: Dead Man's Chest in reference to how to pronounce "Kraken", "It's a mythological creature, I can calls it what I wants!"
Mythological creatures don't have to be bound to biology. Just look at dragons. How are they supposed to fly or breathe fire? Biologically they shouldn't be able to and yet this is very common dragon behavior. But it should also be noted that Dragons in the traditional sense, as far as we know, don't exist.
There are plenty of mythological creatures that don't make biological sense... Unicorns, pegasus, thestrals, Kraken, fauns, mermaids, centaurs...
Angels are supposed to be able to fly or have wings but I don't think anyone ever depicts them with tails. I don't think anyone has ever tried to study the biology of an Arch Angel. As far as I know they are spiritual beings so they don't actually have a biology because they don't have physical bodies.
These depictions of unicorns and mermaids have been around for a very long time. To confine them with realistic biology isn't always good for them. Sometimes they were based on mistaken identity... but the mythological creature is as much interesting than the real animal it's based on. Like cyclops with elephant bones... Dragons with dinosaur bones... Mermaids with manatees... Unicorns with narwhal tusks.