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Today is Charles Darwin's 207th birthday! Darwin, who famously wrote "On the Origin of Species," the book that introduced much of the world to evolution and the theory of natural selection, didn't just write about animals. He also kept quite a few of them as pets, including several dogs, a tortoise (kind of), and pigeons.

Just like Darwin, Mother Nature shares her home with some interesting animal companions. And if you squint, you can see the resemblance they have to more familiar animal faces.

So in celebration of Darwin's birthday and his pets, here are 10 cool animals that don't look exactly like your domesticated Fluffys, Pollys, and Rexes but just might be related to them.

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