On the cover of evolutionary biologist Stephen Jay Gould's book "The Flamingo's Smile," there's a strange image that looks like the legless body of a bright pink swan. Flip the book over, though, and the image is clear: It's a flamingo. Gould chose this image to highlight what might be the strangest fact about that bird: not its peculiar color, or that it likes to stand on one foot, but the fact that most things about it are, well, upside down. It's a striking example of evolution in action.
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Written by Ashley Hamer June 16, 2017
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