The Rise and Reign of the Mammals with Stephen Brusatte
Factually! with Adam Conover
The Difference Between Mammals and Birds
Mammals and birds have been able to regulate body temperature using internal metabolism. We are able to have a high body temperature and a body prature that is constant. That's why if we get a fever, even if our temperature goes a little bit up, we feel really sick. And also, around the same time, these mammals were getting bigger brains, and they were developing milk to feed their babies. So it it was in the triassic period, then, about 225 million years ago, you had proper true mammals emerge on the scene.
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