A panda at the Beijing Zoo bit his third tourist in two years - and this time, his jaws had to be forced open to free the man, who had jumped in to retrieve his son's toy.

Gu Gu, a 240-pound (110-kilogram) panda, mauled the man's legs and refused to let go until zookeepers pried his jaws open with tools, said a zoo spokeswoman surnamed Gong.

Gu Gu first made news in 2007 when he bit a drunken tourist who jumped into his pen and tried to hug him. The tourist retaliated by biting the panda in the back.

In October, Gu Gu bit a teenager who climbed into his exercise area out of curiosity.

The Beijing News said the latest victim, Zhang Jiao of central Anhui province, suffered damage to major ligaments and is recovering from surgery.

The newspaper quoted tourists as saying Zhang appeared to first look around to see if pandas were nearby before jumping in to get his 5-year-old son's toy.