Final answer:
Aggressive behaviors occur when animals compete for food, territory, or mates.
Step-by-step explanation:
Aggressive behaviors occur when animals compete for food, territory, or mates. This is known as competition. Animals may compete intraspecifically (within their own species) or interspecifically (with other species). Intraspecific competition examples include fights between male deer for mates or territorial disputes between birds for nesting sites. Interspecific competition examples include different species of animals competing for the same food source in a shared habitat.