Lots of the traits we think of as defining us as mammals show up pretty early, during the time of the dinosaurs. And, in some cases, they show up a lot earlier and in things that weren’t mammals at all.
The very last mammoths that ever lived experienced what’s known as a mutational meltdown.
Learn More about the Very Rare Medium-Sized Dinosaurs.
The Story of How the Starfish Got its Arms Reminds us that Animals have Deep Histories.
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