December 13, 2008 6:15 PM

The downside of zoo life: even elephants can get fat

The basic cause of chubbiness is no different for moray eels and wildebeests than for humans: "If the energy going in exceeds the energy going out, you're going to get fat," said Karen Lisi, a nutritionist at the Smithsonian National Zoological Park. But how do you know an oyster's too fat and needs to slim down?

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