This black bear was spotted atop a tree in Tampa, Fla., on May 17, 2013. The bear population has been on the rise, so state wildlife officials are calling for a bear hunting season. Skip O'Rourke /MCT /Landov hide caption

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Researcher Jack Hopkins used barbed-wire snares to collect hair samples from bears in Yosemite. Analysis of isotope ratios in hair samples showed how much of the bears' diets came from human food. Courtesy of Jack Hopkins hide caption

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One of the six bears that were rescued from a bile farm is given fresh fruit Wednesday, before being examined. The animals were among some 10,000 bears that Animals Asia says are held in cages for their bile in China. Animals Asia hide caption

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Perhaps not the sight you want to see when you come home: A black bear. U.S. Fish and Wildlife Service hide caption

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