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Line 2: − + − − Chimpanzees have both opposable big toes and opposable thumbs. Most primates have nine wrist bones. Humans, chimps and gorillas have eight; two have fused, stabilising the wrist for knuckle-walking.
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'''Chimpanzee''', often shortened to chimp, is the common name for the two extant species in the genus ''Pan''. The better known chimpanzee is ''Pan troglodytes'', the common chimpanzee, living primarily in West and Central Africa. Its cousin, the [[Bonobo]] or "Pygmy Chimpanzee" as it is known archaically, ''Pan paniscus'', is found in the forests of the [[Democratic Republic of the Congo]]. The Congo River forms the boundary between the two species.
'''Chimpanzee''', often shortened to chimp, is the common name for the two extant species in the genus ''Pan''. The better known chimpanzee is ''Pan troglodytes'', the common chimpanzee, living primarily in West and Central Africa. Its cousin, the [[Bonobo]] or "Pygmy Chimpanzee" as it is known archaically, ''Pan paniscus'', is found in the forests of the [[Democratic Republic of the Congo]]. The Congo River forms the boundary between the two species.
The name "chimpanzee", adopted by Europeans in 1738, derives from the Bantu ''kivili-chimpenze'' ("mock man"), though 16th century Portugese explorers called them "pygmies".
The name "chimpanzee", adopted by Europeans in 1738, derives from the Bantu ''kivili-chimpenze'' ("mock man").
==Physiology==
==Physiology==
A full grown adult male chimpanzee can weigh from 35-70 kilograms (75-155 pounds) and stand 0.9-1.2 meters (3-4 feet) tall, while females usually weigh 26-50 kg (57-110 pounds) and stand 0.66-1 meters (2.0-3.5 feet) tall.
A full grown adult male chimpanzee can weigh from 35-70 kilograms (75-155 pounds) and stand 0.9-1.2 meters (3-4 feet) tall, while females usually weigh 26-50 kg (57-110 pounds) and stand 0.66-1 meters (2.0-3.5 feet) tall.
==Lifespan==
==Lifespan==