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Questions tagged [mammals]

For questions about mammals as they evolved on Earth. This may include, but is not limited to, warm-bloodedness, the possession of fur, the ability to secrete milk, and the bearing of live young.

11
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3answers
2k views

What evolutionary factors can contribute to large sexual dimorphism in large mammals?

On Earth, the polar bear is among the most sexually dimorphic animals, with males being on average almost twice as heavy as females (Wikipedia claims average weights of 450 kg for males versus 260 kg ...
2
votes
2answers
278 views

Egg pouch: Chest or Abdomen? [closed]

My aliens in my generation ship story are reptilian with some mammal characteristics. They have 2 hands, each of which has 6 fingers. 2 of those fingers are thumbs and the thumbs are on opposite ...
1
vote
4answers
275 views

Bats With Pterosaur Wings

Perhaps THE hallmark of bat anatomy is the wing--a thin sheet of membranous skin attaching four of five fingers. But compared to another group of skin-winged fliers, that's pretty much it. According ...