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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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size in large hypercarnivores across the globe. Even fully-grown Paraceratherium, the largest land mammals ever, evidently were preyed on by giant Crocodylus bugtiensis. Blue whales are immune to … . Instead, let the cows reside at the top of the food chain. Herbivorous animals have turned carnivorous numerous times in Earth's history. Among mammals, there are the mesonychids, entelodonts and …
answered May 22 by SealBoi
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definition, all the members of a clade are descended from a common ancestor. But, on an alien world, there can be no common ancestry between clades of both planets. Therefore, there are neither mammals nor …
answered Aug 11 '18 by SealBoi
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They are visually and biologically similar to ‘normal’ rats (such as rattus rattus or rattus norvegicus) though they are typically larger and have a higher intelligence. No problems here, tha …
answered May 31 by SealBoi
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no reptiles. Without reptiles, there would be no mammals or birds. So, I suggest that you wipe out corals far further into the future, at least as recent as the K-Pg extinction. If you can find some …
answered Jun 10 '18 by SealBoi
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While I wish them no disrespect, there are a few mistakes in Bellerophon's answer. First of all - rafting migration most certainly does happen, and has happened many many times in Earth's history. It …
answered May 25 by SealBoi
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continent and managed to colonize much of the ocean, however, they have failed to compete with several new marine tetrapod descendants of tegus and even other aquatic mammals, so are limited in …
answered Jun 26 '18 by SealBoi
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Time to answer your question with more maps. Fun! So, here's a map, or rather two maps, of the proposed vegetation zones in the Tortonian stage of the Miocene. It's not exactly the end of the Miocene …
answered Apr 28 by SealBoi
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Yes. Some carnivorans are already facultative bipeds. Raccoons can squat on two legs to feed, and indeed one hypothesis on human evolution suggests bipedalism came from squat feeding. Meerkats often s …
answered Apr 28 by SealBoi