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
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.