Over 150,000 people have viewed the short clip on YouTube, since the 21-year-old was captured strolling around Port Lympne Wild Animal Park in Kent. A second and longer clip of Ambam has since been posted on the video-sharing site.
Phil Ridges, the gorilla keeper, says that Ambam’s father Bitam used to display the same behavior if he had handfuls of food to carry and that Ambam’s sisters also sometimes stand and walk the same but none do it like Ambam, according to the report.
"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,” Ridges says. "Ambam can also carry a lot more food if he stands and uses both hands and walking on two feet also means he doesn’t get his hands wet when it is raining."