A drunken Chinese migrant worker jumped into a panda enclosure at the Beijing Zoo, was bitten by the bear and retaliated by chomping down on the animal's back, state media said Wednesday. Zhang Xinyan, from the central province of Henan, drank four jugs of beer at a restaurant near the zoo before visiting Gu Gu the panda on Tuesday, the Beijing Morning Post said. "He felt a sudden urge to touch the panda with his hand," and jumped into the enclosure, the newspaper said. The panda, who was asleep, was startled and bit Zhang, 35, on the right leg, it...