This mental capability, combined with an erect body carriage that frees the hands for manipulating objects, has allowed humans to make far greater use of tools than any other living species on Earth. Humans have a highly developed brain and are capable of abstract reasoning, language, introspection, and problem solving. Anatomically modern humans originated in Africa about 200,000 years ago, reaching full behavioral modernity around 50,000 years ago. Humans (known taxonomically as Homo sapiens, Latin for "wise man" or "knowing man") are the only living species in the Homo genus. The species has also been found creating sharpened sticks to spear Senegal bushbabies out of small holes in trees. Nearly all chimpanzee populations have been recorded using tools, modifying sticks, rocks, grass, and leaves and use them for acquiring honey, termites, ants, nuts, and water. The species lives in a male-dominated, strict hierarchy, which means disputes can generally be settled without the need for violence. The common chimpanzee lives in groups which range in size from 15 to 150 members, although individuals travel and forage in much smaller groups during the day. Infants are weaned when they are about three years old, but usually maintain a close relationship with their mother for several more years it reaches puberty at the age of eight to ten, and its lifespan in captivity is about fifty years. It is considered more robust than the bonobo, weighing between 40 and 70 kg (88 and 150 lb) and measuring approximately 1.6 to 1.3 m (5 ft 3 in to 4 ft 3 in) from head to tail. The common chimpanzee is covered in coarse black hair but has a bare face, fingers, toes, palms of the hands and soles of the feet. Evidence from fossils and DNA sequencing show that both species of chimpanzees are the sister group to the modern human lineage. Colloquially, the common chimpanzee is often called the chimpanzee (or 'chimp'), though technically this term refers to both species in the genus Pan: the common chimpanzee and the closely related bonobo, formerly called the pygmy chimpanzee. The common chimpanzee ( Pan troglodytes), also known as the robust chimpanzee, is a species of great ape.
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