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Instinct is a term used to describe a set of behaviors that are both unlearned and set in motion as the result of some environmental trigger. Instincts are also often discussed in relation to motivation since they can also occur in response to an organism’s need to satisfy some innate internal drive tied to survival.
Instincts are present across species and are consistent within individual species. In other words, many different species rely on instincts, and if one member of a species possesses an instinct, then they all do.
Before we move into a discussion of specific types of instincts, it is important to distinguish the difference between an instinct and a reflex. Both are types of unlearned behavior that tend to serve a survival purpose. The difference is that a reflex is a typically a simple reaction or a response to an environmental trigger whereas an instinct is a much more complex set of behaviors.

Instincts are unlearned behaviors activated by environmental triggers, often linked to an organism’s internal drives for survival. Present across species, these behaviors remain consistent within species, meaning if one member has an instinct, others do too. Unlike reflexes, which are simple responses to stimuli, instincts involve complex behavioral patterns essential for survival.