Chimpanzees, colloquially called chimps, are two extant hominid species of apes in the genus Pan. The Congo River divides the native habitats of the two species:Common chimpanzee, Pan troglodytes (West and Central Africa)Bonobo, Pan paniscus (forests of the Democratic Republic of the Congo)Chimpanzees are members of the family Hominidae, along with humans, gorillas, and orangutans. They split from the human line about four to six million years ago, see Chimpanzee-human last common ancestor. Chimpanzees (subtribe Panina) are the closest living relatives to humans (subtribe Hominina); both are members of the tribe Hominini. Chimpanzees are the only known members of the subtribe Panina.The two Pan species, bonobo and common chimpanzee, split about one million years ago. This article uses the individual name when distinguishing one species or the other, and uses Pan or chimpanzee (or chimp) when both or either one is implied.