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Sleep can follow a physiological or behavioral definition. In the physiological sense, sleep is a state characterized by reversible unconsciousness, special brainwave patterns, sporadic eye movement, loss of muscle tone (possibly with some exceptions; see below regarding the sleep of birds and of aquatic mammals), and a compensatory increase following deprivation of the state, this last known ...
Eventually they became so big that it was no longer possible for them to get both safe and proper sleep on bare branches alone, so they started building sleeping platforms in the trees. This appeared to have happened when their weight passed 30 kilos, as only apes above 32 kilos build nests. [16] [17] Which in turn led to shorter and deeper ...
The arms of a chimpanzee are longer than its legs and can reach below the knees. The hands have long fingers with short thumbs and flat fingernails. The feet are adapted for grasping, and the big toe is opposable. The pelvis is long with an extended ilium. A chimpanzee's head is rounded with a prominent and prognathous face and a pronounced ...
A group of chimpanzees grooming. Chimpanzees live in communities of typically 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 rests in trees at night, but spends the day on the ground. [5]
Bubbles (born 1983) is a chimpanzee once kept as a pet by the American singer Michael Jackson, who bought him from a Texas research facility in the 1980s.Bubbles frequently traveled with Jackson, drawing attention in the media.
The bonobo (/ b ə ˈ n oʊ b oʊ, ˈ b ɒ n ə b oʊ /; Pan paniscus), also historically called the pygmy chimpanzee (less often the dwarf chimpanzee or gracile chimpanzee), is an endangered great ape and one of the two species making up the genus Pan (the other being the common chimpanzee, Pan troglodytes). [4]
The Hominidae (/ h ɒ ˈ m ɪ n ɪ d iː /), whose members are known as the great apes [note 1] or hominids (/ ˈ h ɒ m ɪ n ɪ d z /), are a taxonomic family of primates that includes eight extant species in four genera: Pongo (the Bornean, Sumatran and Tapanuli orangutan); Gorilla (the eastern and western gorilla); Pan (the chimpanzee and the bonobo); and Homo, of which only modern humans ...
The chimpanzee [dubious – discuss] fossil record has long been absent and thought to have been due to the preservation bias in relation to their environment. However, in 2005, chimpanzee fossils were discovered and described by Sally McBrearty and colleagues.