This is not a bear in a zoo. This bear is wild and I seen it climbing out of a tree with her cubs in Cades Cove located in the Great Smoky Mountains National Park, Gatlinburg, TN. I was hand holding my camera with a 500mm lens on it and this is the only one that was almost sharp. I didn't have time to run back to the car to get a tripod.
Thank you Pablo. Black bears rarely attack humans except when provoked, there's food around or if you get to close to the cubs. I've seen park rangers chase a bear away by running up to it yelling while hitting the ground with a large tree branch.