Like, I'm aware of there being exceptions like Penguins, Ostriches, and Bats. But in general, why is there such a distinct land/air split between mammals and birds? Why don't mammals share the ground with ecosystems of plant- and meat-eating walking birds? Why didn't we get birds that evolved to slither like snakes, or tunnel like rodents? Why isn't it (land+sky) all just mammals, where we'd have parrot- and vulture-like bats that don't lay eggs? If we started the simulation again, might things like this evolve?

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[–] 3 points 1 year ago (1 child)

At the same time, it was also not mammals that ruled the ground, it was, as many an eight year-old can attest, dinosaurs.

Arthropods who've been ruling the world for 500 million years: Why do dinosaurs get all the hype? 😭 😭 😭

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