How Man Differs from Other Animals
In adult life man is unique in his erect posture, and in the freedom of his hands from any direct share in locomotion. His body is usually naked, his canine teeth are not longer than their neighbors, his thumbs are larger than those of monkeys, and his feet are distinguished by the horizontal sole which rests flatly on the ground. His face is notably more vertical than that of apes, lying below rather than in front of the forepart of the brain-case; the jaws, the orbits, and the ridges above them are relatively smaller; the nose-bones project more beyond the upper jaw; and the chin is more prominent than in other Primates.