Blue-Footed Booby

Photograph by Tim Laman

These distinctive webbed feet belong to a blue-footed booby of the Galápagos Islands. The bluer, the better: Courting males show off with a high-stepping strut—and those with brighter feet are more attractive to potential mates.

(For more pictures of the amazing colors of our world, buy the National Geographic book Life in Color.)

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