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A 2012 study identifying individual chimpanzees that consistently performed highly on cognitive tasks found clusters of abilities instead of a general factor of intelligence. [48] This study used individual-based data and claim that their results are not directly comparable to previous studies using group data that have found evidence for g .
In a multi-species study, it was shown that chimpanzees, bonobos and orangutans passed the False Belief Test (see above). [ 25 ] In 2009, a summary of the ToM research, particularly emphasising an extensive comparison of humans, chimpanzees and orang-utans, [ 28 ] concluded that great apes do not exhibit understanding of human referential ...
The second list shows the number of neurons in the structure that has been found to be representative of animal intelligence. [1] ... Chimpanzee: 2.8 × 10 ^ 10 [56 ...
Similarly to gorillas and chimpanzees, orangutans have 48 diploid chromosomes, in contrast to humans, which have 46. [ 25 ] : 30 According to molecular evidence , within apes (superfamily Hominoidea), the gibbons diverged during the early Miocene between 24.1 and 19.7 million years ago (mya), and the orangutans diverged from the African great ...
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 ...
Encephalization quotient (EQ), encephalization level (EL), or just encephalization is a relative brain size measure that is defined as the ratio between observed and predicted brain mass for an animal of a given size, based on nonlinear regression on a range of reference species.
Monkeys and chimpanzees do learn to do this, as do pigeons if they are given a great deal of practice with many different stimuli. However, because the sample is presented first, successful matching might mean that the animal is simply choosing the most recently seen "familiar" item rather than the conceptually "same" item.
Chimpanzees have also been observed making "sponges" out of leaves and moss that suck up water. [186] Sumatran orangutans have been observed making and using tools. They will break off a tree branch that is about 30 cm long, snap off the twigs, fray one end and then use the stick to dig in tree holes for termites.