What is territorial aggression? Is there an evolutionary explanation for why territorial aggression exists? Territorial aggression is an Evolutionarily Stable Strategy (ESS) in which a population of animals aggressively protects their territory and retreats when they enter the territory of another aggressive animal. The strategy is only stable if the whole animal population sticks to it. Read more about the evolutionary need for aggression, including territorial aggression.
Territorial Aggression: Why Animals Fight
