Sir Wilfrid E. Le Gros Clark proposed three prominent tendencies in primates; arboreal adaptation, dietary plasticity and parental investment. Arboreal adaptation indicates a suite of physical traits that enable an organism to live in trees. Primates express arboreal adaptation in a set of behaviors and anatomical characteristics that is unique among mammals. Dietary plasticity refers a diet's flexibility in adapting to a given environment. This tendency is observed in primates as they used to eat a wide variety of foods to survive in different circumstances. Parental investment dictates the time and energy parents expend for their offspring's benefit. Primates express parental investment as they spend lots of time for nurturing their offspring.
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