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.