| A | B | 
| animal behavior | what an animal does when interacting with its environment | 
| immediate cause | explanation of an organism's behavior based on its immediate interactions with the environment | 
| ultimate cause | explanation of an organism's behavior based on its evolutionary adaptations | 
| innate behavior | behavior performed correctly and in the same way by all individuals of a species, without previous experience | 
| fixed action pattern | innate behavior that occurs as an unchangeable sequence of actions | 
| circadian rhythm | rhythmic pattern of behavior (in an animal) or biological cycle (in a plant) that follows an approximately 24-hour natural cycle | 
| learning | a change in behavior resulting from experience | 
| habituation | type of learning in which an animal stops responding to a repeated stimulus that conveys little or no important information | 
| imprinting | a usually irreversible type of learning limited to a specific time period in an animal's life | 
| conditioning | type of learning in which a particular stimulus or response is linked to a reward or punishment | 
| insight | performing a behavior correctly or appropriately in a new situation, without previous experience | 
| aggressive behavior | symbolic threat display or a physical struggle between individuals of the same species | 
| dominance hierarchy | ranking of individuals in a group based on aggressive behavior | 
| territory | area defended by an individual, usually excluding other members of the same species | 
| courtship ritual | elaborate behavior of individuals of the same species before mating | 
| communication | signals among animals that include sounds, odors, visual displays, and touches | 
| cooperation | group behaviors in which individuals work together in a way that benefits the group |