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.

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13
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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 ...
13
votes
2answers
894 views

How plausible would a fully aquatic bat be?

So, it turns out that bats are actually pretty good swimmers; several species of bats have been reported swimming, and they're far more capable and agile in the water than they are on land: https://...
2
votes
2answers
319 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 ...
9
votes
2answers
174 views

Could Xenarthrans Be Ferried Outside South America?

Right from the beginning, the xenarthrans--armadillos, sloths and anteaters--have been at a disadvantage. For the longest time, their home was an island continent, which made them extremely ...
1
vote
4answers
317 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 ...