A Silverback gorilla called Ambam has become an internet sensation after being filmed walking on his hind legs.
Over 150,000 people have viewed the short clip on YouTube, where the 21-year-old is captured strolling around Port Lympne Wild Animal Park in Kent.
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A second and longer clip of Ambam has since been posted on the video-sharing site.
Phil Ridges, gorilla keeper, said: "Ambam's father Bitam used to display the same behaviour if he had handfuls of food to carry.
"Ambam also has a full sister, Tamba, and a half sister who also sometimes stand and walk in the same way. All gorillas can do it to some extent but we haven't got any who do it like Ambam and he is quite a celebrity at the park.
"We think he might use it to get a height advantage to look over the wall when keepers come to feed him and standing up can also help him in looking for food generally in his enclosure as it gives him a better vantage point.
