Don't suddenly jump into a zoo cage

A zoo / Park is a place where animals are kept, for scientific observation, for protection, and for people to get a look at these animals. A lot of these are wild animals, who can be dangerous for humans if they come in close unsupervised proximity to these animals. There have been cases of wild bears / tigers / lions, and others causing harm (including death) to humans who have suddenly jumped into their cage. However, there are always humans who apply their own thoughts in their dealings with animals. Take this case where a person jumped into the enclosure of a panda, because the animal was so cute after all:

BEIJING (AP) -- A college student in southern China was bitten by a panda after he broke into the bear's enclosure hoping to get a hug, state media and a park employee said Saturday. The park in Guilin, a popular tourist town in the Guangxi Zhuang Autonomous Region, houses a small zoo and a panda exhibit. It was virtually deserted when the student scaled the fence surrounding the panda, named Yang Yang, the employee said.
He said the student was bitten on the arms and legs. Two foreign visitors who saw the attack ran to get help from workers at a nearby refreshment stand, who notified park officials, the employee said. "We cannot make it like a prison. We already have signs up warning people not to climb in," he said. "There are no fences along roads but people know not to cross if there are cars. This is basic knowledge." Pandas, which generally have a public image as cute, gentle creatures, are nonetheless wild animals that can be violent when provoked or startled.

There is a reason that wild animals are kept in cages or away from humans; it is only those humans who are expert in dealing with animals who can do this unsupervised.