Tweaking the mammal family tree with ancient DNA and fossil proteins. Mammals are those hairy, milk-producing, warm-blooded animals that can be found in nearly all the major ecosystems on Earth. They comprise around 5,400 living species and range in size from tiny monkeys and bats, little more than an inch long, to enormous whales, some of which are the largest animals to have ever lived. How do we reconstruct family trees? Was more closely relat.

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