Instinct
Reflex actions are a special case. A true reflex is distinguished from other behaviours by mechanism; they do not go through the brain. Rather, the stimulus travels to the spinal cord and the message is then transmitted back through the body, tracing a path called the reflex arc. Reflexes are similar to fixed action patterns, but a fixed action pattern can be processed in the brain as well. A male stickleback's instinctive aggression towards anything red during his mating season is such an example.  Examples of instinctive behaviours in humans include many of the primitive reflexes, such as rooting and suckling, behaviours which are present in most mammals.