the strong grip of a baby is another example. it is a vestigial reflex, a remnant of the past when pre-human babies clung to their mothers' hair as the mothers swung through the trees. this is borne out by the babies' feet, which curl up when it is sitting down (primate babies grip with the feet as well). all primates except modern man have thick body hair to which an infant can cling, unlike modern humans. the grasp reflex allows the mother to escape danger by climbing a tree using both hands and feet.