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The Eastern chimpanzee or East African chimpanzee (Pan troglodytes schweinfurthii) is a subspecies of the common or robust chimpanzee. It occurs in East Africa. The 2007 IUCN Red List classified them as Endangered. Although the common chimpanzee is the most abundant and widespread of the non-human great apes, recent declines in East Africa are expected to continue due to hunting and loss of habitat. Because chimpanzees and humans are so physiologically similar, chimpanzees succumb to many diseases that afflict humans. If not properly managed, research and tourism also presents a risk of disease transmission between humans and chimpanzees. Colin Groves of the Australian National University argues that there is enough variation between the northern and southern populations of P. t. schweinfurthii to be split into two subspecies instead of one; the northern population as P. t. schweinfurthii and the southern population as P. t. marungensis. This subspecies has been extensively studied by Dr. Jane Goodall at Gombe National Park. Adult chimpanzees in the wild weigh between 40 and 65 kilograms (88 and 143 pounds). Males can measure up to 160 centimetres (63 inches) and females up to 130 centimetres (51 inches) in height. The chimpanzee's body is covered with coarse black hair, except for the face, fingers, toes, palms of the hands and soles of the feet. Both of its thumbs and its big toes are opposable, allowing a precision grip. The chimpanzee spends time both in trees and on the ground, but usually sleeps in a[clarification needed] tree, where it builds a nest for the night. They once inhabited most of this region, but their habitat has been dramatically reduced in recent years. Chimpanzees live in communities that typically range from 20 to more than 150 members, but spend most of their time traveling in small parties of just a few individuals. The eastern chimpanzee is both arboreal and terrestrial and spend its nights in the trees, while most of its daytime hours are spent on the ground.Chimpanzees walk using the soles of their feet and their knuckles, and they can walk upright for short distances. Chimpanzees are 'knuckle walkers', like gorillas, in contrast to the quadrupedal locomotion of orangutans and bonobos known as 'palm walkers' who use the outside edge of their palms. When confronted by a predator, chimpanzees will react with loud screams and use any object they can get against the threat. The leopard is the chimpanzee's main natural predator, but they have also fallen prey to lions.




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