Which term best defines the act of birds traveling to warmer regions?

Migration is the term that best defines the act of birds traveling to warmer regions. This behavior is typically seasonal, where birds move from their breeding grounds in colder climates to more temperate or warmer areas during the colder months. This movement is primarily driven by the need for food, more favorable climatic conditions, and suitable habitats for nesting. Birds often undertake these long-distance journeys to escape harsh winter conditions, ensuring their survival and maintaining their populations.

The other terms represent different biological and ecological processes. Hibernation refers to a state of dormancy that some animals enter during winter to conserve energy, while metamorphosis describes the developmental transformation in certain animals from juvenile to adult forms, such as in insects. Reproduction is the biological process through which new individuals are produced, and while it can occur during migration, it is not the act of traveling itself. Thus, migration is the most accurate term for this specific behavior.