Scientists at the Max Planck Institute for Evolutionary Anthropology, as well as Rocky Vista University (USA), show that gorillas spend much more time in the trees than previously thought. Gorillas are typically considered the most terrestrial of the great apes due to their large body size (males average up to 170 kg or 375 lbs) and a diet comprising primarily terrestrial vegetation. However, new research shows that some gorilla populations can spend just as much time in the trees as some chimpanzee populations. Even large adults can average up to 20 to30 percent of their time in the trees to forage on leaves and fruit. This broader understanding of gorilla behaviour has important implications for how we interpret gorilla anatomy, their adaptive ecology, and gorilla-like features in our ape and human fossil relatives.