Ambam, a Western lowland gorilla, was filmed strolling about his enclosure by animal researcher Johanna Watson.
She posted the clip on YouTube, where it has been viewed by more than 250,000 people.
Ambam, a 21-year-old silverback, is part of a bachelor group of the critically endangered animals at Port Lympne Wild Animal Park, which is run by an international conservation charity, The Aspinall Foundation.
Photo Blog: Gorilla that walks like a man Gorilla keeper Phil Ridges said Ambam, who now weighs 485 pounds, had been hand-reared at another animal park when he was a one-year-old for several months because he was ill.
He said the human-like walking style seemed to run in the family.
"Ambam’s father Bitam used to display the same behavior if he had handfuls of food to carry," Ridges said in a statement. "Ambam also has a full sister, Tamba, and a half sister ... who also sometimes stand and walk in the same way."
Video: Look ma, no hands! Gorilla walks on hind legs (on this page) Ridges added that Ambam could also carry more food if his hands were freed from walking and it also meant "he doesn't get his hands wet when it is raining."
The Aspinall Foundation runs gorilla rescue and rehabilitation projects in Congo and Gabon.
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