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A chimpanzee's testicles are unusually large for its body size, with a combined weight of about 4 oz (110 g) compared to a gorilla's 1 oz (28 g) or a human's 1.5 ounces (43 g). This relatively great size is generally attributed to sperm competition due to the polygynandrous nature of chimpanzee mating behaviour .
Chimpanzees may react to lions by fleeing up trees, vocalising, or hiding in silence. [82] The chimpanzee louse Pediculus schaeffi is closely related to the human body louse P. humanus. Chimpanzees and humans share only 50% of their parasite and microbe species. This is due to the differences in environmental and dietary adaptations; human ...
Adult chimpanzees in the wild weigh between 40 and 65 kilograms (88 and 143 pounds). Males can measure up to 145 centimetres (57 inches) and females up to 120 centimetres (47 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.
Although large male chimpanzees can exceed any bonobo in bulk and weight, the two species broadly overlap in body size. Adult female bonobos are somewhat smaller than adult males. Body mass ranges from 34 to 60 kg (75 to 132 lb) with an average weight of 45 kilograms (99 lb) in males against an average of 33 kg (73 lb) in females. [35]
Extant primates exhibit a broad range of variation in sexual size dimorphism (SSD), or sexual divergence in body size. [4] It ranges from species such as gibbons and strepsirrhines (including Madagascar's lemurs) in which males and females have almost the same body sizes to species such as chimpanzees and bonobos in which males' body sizes are larger than females' body sizes.
English: Comparison of size of adult chimpanzee (Pan troglodytes) and adult human. This image assumes a height of 1.75 m for the human and 1.2 m for the chimpanzee.
Brain size usually increases with body size in animals (i.e. large animals usually have larger brains than smaller animals); [4] the relationship is not, however, linear. Small mammals such as mice may have a brain/body ratio similar to humans, while elephants have a comparatively lower brain/body ratio. [4] [5]
As a rule, primate brains are "significantly larger" than those of other mammals with similar body sizes. [4] Until well into the 19th century, juvenile orangutans were taken from the wild and died within short order, eventually leading naturalists to mistakenly assume that the living specimens they briefly encountered and skeletons of adult ...