A black bear looks up at a line of picture-taking tourists near the popular Laurel Falls Trail in Great Smoky Mountains National Park, which is on the border of North Carolina and Tennessee.
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
A bear cub that had to be rescued from a tree after getting its head stuck in a cookie jar is shown in a handout photo from the New Jersey Department of Environmental Protection.
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