Instinct

Instinct is inherited behavior. It is the part of behavior with respect to which animals are born fully educated. It is automatic and instantaneous in action. It is common to all members of a species; in matters of vital importance, all tend to act alike. It is by instinct that birds build their nests, and that spiders spin their webs, and that ant-lions dig their pits. They do these things without practice, without fumbling; they do them without instruction or example. The products of these...