Innate behaviors, such as kinesis, taxis, and migration, are instinctual responses to external stimuli.
Animals communicate using signals, which can be chemical (pheromones), aural (sound), visual (courtship displays), or tactile (touch).
Altruistic behaviors may be explained by the natural instinct to improve the chances of passing on one's genes.
In mating, there are two types of selection (intersexual, intrasexual) and three mating systems (monogamous, polygynous, polyandrous).
Simple learned behaviors include habituation and imprinting, both of which are important to the maturation process of young animals.
In classical conditioning, a behavior is paired with an unrelated stimulus; in operant conditioning, behaviors are modified by consequences.
Cognitive learning relies on cognitive processes such as reasoning and abstract thinking; it is much more efficient than conditioning.