Hercules and Leo were trained to habitually walk on two legs. "It's not unusual for chimps and gorillas to stand up, but they don't usually walk very far," he told us. The 18-year-old Louis has caught everyone’s fancy thanks to his preference for walking upright … What gorilla's upright walk could tell us about evolution Louis is not like his fellow playmates. In the wild, Western lowland gorillas like Louis might do it for a few seconds to reach food or wade into swamps. Western lowland gorillas are a critically endangered species with an estimated population of only 100,000. However, even with training, bipedal locomotion remains unnatural and inefficient for them because of their anatomy. Orang-utans do the most upright walking of all, which they use in the trees, walking along branches while holding upper branches. Chimps and gorillas do not normally walk upright, but they can for a time if they want to. Apparently humans aren't the only ones who know how to multi-task. Ambam, a Western Lowland Gorilla, has recently become famous for walking upright on his hind legs, MSNBC reports. Bonobos (pygmy chimpanzees) are the next great walkers. Our closest living relatives, the great apes, can certainly appear human-like when they walk upright, and other primates, such as lemurs, amuse people when they ‘skip’ for brief periods. Do you have a story for The Sun Online news team? Stern says it’s “pretty unusual” for gorillas to walk around upright. Apparently gibbons do it really well. The Great Apes have their upright walking moments too but their skeletons are not designed for bipedalism. Orangutans, gorillas and chimpanzees do it. Apes are known to walk upright once in awhile, although bonobos seem to do it more frequently than other apes. Like gorillas, they also walk upright while wading. Bonobos seem to love doing it. 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