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

itoggle caption Courtesy of Jack Hopkins

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

itoggle caption Animals Asia

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

itoggle caption U.S. Fish and Wildlife Service