... look at the effects of tool use. Capuchin monkeys were given task of pushing peanut butter out of a tube. They found that the monkeys were quick at finding a suitable stick but tried out many unsuitable ones first. This suggests no understanding of causal relationships and that many animals develop the skill through trial and error rather than insight. Only the great apes show the sophisticated understanding of cause and effect so this supports the link between tool use and intelligence. The association between the growth of hunting and intelligence shows that more intelligent individuals are more intelligent than less intelligent. However many species with very successful hunting techniques are not very intelligent and therefore it is unlikely that the benefits of hunting would account for human levels of intelligence. The efficiency in foraging of a particular animal has been shown by various psychologists. Galef (1988) did a study ...

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