Fixed Action Pattern (FAP): A sequence of unlearned acts directly linked to a simple stimulus. Like how geese will roll an egg back into their nest if it falls out - no one taught them this; they just do it instinctively.
Reflexes: These are automatic responses to specific stimuli that occur without conscious thought, such as blinking when something comes close to your eye.
Imprinting: A type of learning where young animals form attachments during a critical period very early in life. Think about how ducklings follow their mother around - that's imprinting.