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For questions regarding the viability of a life-form design. These questions should focus on biologically plausible creatures.

8 votes
4 answers
342 views

Reasonable color-changing mammal?

There are a number of animals that can change color in a short time, like some chameleons and octopuses. Is there any reasonable way for a color-changing mammal to evolve naturally? I'm looking to e …
Joe's user avatar
  • 1,628
10 votes
7 answers
2k views

What aspects of a creature's hand would make it good for climbing but not good for tool use?

I'm trying to design a mammal that lives in trees. I'd like its hands to be good for climbing, but not good for using tools. What aspects of the hand would make it good for climbing and not good for …
Joe's user avatar
  • 1,628
7 votes
5 answers
314 views

Color-changing armored creature?

Could a creature reasonably have both armor (in the sense of armadillos or pangolins) and be able to change color over the short term (less than a day)? I'm afraid I don't know enough about biology t …
Joe's user avatar
  • 1,628
14 votes
6 answers
5k views

Why would a creature need to eat hair?

In a story I'm working on, there are some creatures that eat hair, wool, fur, and anything similar. They're not mites or insects, but are (very roughly) the size of humans. Is there any realistic re …
Joe's user avatar
  • 1,628
6 votes
4 answers
329 views

What evolutionary pressures would lead to being skilled at counting and basic arithmetic?

Let's say we came across a new species of moderately intelligent birds. Like Alex the parrot, these birds are able to learn a few words and simple concepts. But once we teach these birds the words f …
Joe's user avatar
  • 1,628
36 votes
21 answers
7k views

How could a species survive on just luring in and eating humans?

In a question about mermaids, it was proposed that they might have evolved to look like humans to lure them in and prey on them. How could a creature survive on a diet of nothing but lured-in humans? …
Joe's user avatar
  • 1,628