A recent undercover video shows the startling depths of despair many animals face in some of China's zoos.
In the shocking footage, lions, tigers, bears and monkeys can be seen being beaten during training exercises. When not performing, they're chained or locked up in tiny cages, with barely any room to move around.
One heartbreaking shot shows a young lion cub, barely a month old, cowering on the ground in front of the camera. He appears to be weak and emaciated, and can barely move, but growls at the camera in fright when any humans get too near.