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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.
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 .
Chimpanzee hand (left) compared to human hand. Chimpanzee bodies are covered by coarse hair, except for the face, fingers, toes, palms of the hands, and soles of the feet. Chimpanzees lose more hair as they age and develop bald spots. The hair of a chimpanzee is typically black but can be brown or ginger.
This is a list of large extant primate species (excluding humans) that can be ordered by average weight or height range. There is no fixed definition of a large primate, it is typically assessed empirically. [1]
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]
Formerly the bonobo was known as the "pygmy chimpanzee", despite the bonobo having a similar body size to the common chimpanzee. The name "pygmy" was given by the German zoologist Ernst Schwarz in 1929, who classified the species on the basis of a previously mislabeled bonobo cranium, noting its diminutive size compared to chimpanzee skulls.
Levator claviculae are present (absent in humans). Longus colli, pectoralis, latissimus dorsi, gluteus maximus, gluteus medius, psoas major, psoas minor, iliacus internus, and the gastrocnemius internalis are more similar to apes and monkeys than humans. Deltoid, pronator radii trees, and extensors pollicis brevis are different from a human's.
But, later fossil finds indicated that Ramapithecus was more closely related to the orangutan; and new biochemical evidence indicates that the last common ancestor of humans and non-hominins (that is, the chimpanzees) occurred between 5 and 10 million years ago, and probably nearer the lower end of that range (more recent); see Chimpanzee ...