Along with our other great ape cousins, the gorillas, chimps, and bonobos, they belong to our Hominidae family tree, which stretches back 14 million years.

它们与我们的其他大猩猩表亲、大猩猩、黑猩猩和倭黑猩猩一起，属于我们的人科家族，可追溯到 1400 万年前。