Nonnative pythons, like this one, are invading the Florida Everglades. As a top predator, the snakes have crippled the populations of rabbits, raccoons and other animals. Joe Raedle/Getty Images hide caption

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A veiled chameleon (Chamaeleo calyptratus) at the Rolling Hills Wildlife Adventure outside Salina, Kan. Joel Sartore hide caption

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The Picture Show

One Man's Quest To Capture America's Endangered Zoo Animals (With A Camera)

For Joel Sartore, it's a race against the clock to photograph as many animals as he can — before it's too late.

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New advice on housing lab rodents has left research centers confused about compliance and worried about the costs. Tom Gannam/AP hide caption

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