Schleich Wild Life Realistic Male Gorilla Animal Figurine - Authentic Detailed Wild Male Gorilla Toy for Boys and Girls Education Imagination and Play, Highly Durable Gift for Kids Ages 3+

Male gorillas often beat their fists on their chests. They do so to show who is the strongest in the group. However, it can also be a kind of greeting. Gorillas don't just walk on the palms of their hands, but also on their knuckles. For this reason, they're also known as knuckle-walkers.