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Skeletal DetailsHuman hand This modern Homo sapiens hand shows an enlarged, opposable thumb which is good for manipulating objects and creating a powerful grip. It also shows that bipedal animals have lightly built hands and finger bones that are relatively short, thin and straight. (Quadrupedal animals that walk on their knuckles have heavily built hands and finger bones that are relatively long and curved. Quadrupedal animals that climb trees have lightly built hands and finger bones that are relatively short, thin and straight.)
Hand of Australopithecus afarensis
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