human
There are many other activities, not so obviously vital as these, for which nature winds him up quite as thoroughly--yes, and sets him to go off at the proper time for each. He will suck when brought to the breast as unfailingly as his lungs will begin to work upon contact with the air. He will cry from hunger or discomfort, clasp anything that touches his fingers or toes, carry to his mouth whatever he can grasp, in time smile when smiled at, later grow afraid when left alone or in the dark, manifest anger and affection, walk, run, play, question, imitate, collect things, pull things apart, put them together again, take pleasure in being with friends, act shy before strangers, find a chum, belong to a 'gang' or 'bunch,' quarrel, fight, become reconciled, and some day fall in love with one of the opposite sex. These, and many more, are just his natural human ways. He does not of purpose initiate them any more than he initiates breathing or heart-beat. He does these things because he is so born and built. They are his instincts.