Great apes—chimpanzees, bonobos, gorillas, and orangutans—are humanity’s closest relatives. (Technically, we’re great apes too.) We have a lot in common. In general, great apes are highly social and intelligent. They often live in family groups, raise young together, and rely on each other.

Apes are capable of recognizing themselves in a mirror (a common test of animal intelligence), and they even use tools. For instance, bonobos use sticks to “fish” termites out of their mounds. Chimpanzees have even been observed sharpening sticks to use as spears for hunting!

Photo by Mike Richey