The term that describes the seasonal migration of animals is "migration." This phenomenon involves the regular, often long-distance movement of species in search of food, mating grounds, or suitable climates. Migration can occur in various forms, including fully migratory species, which travel to complete life cycles, and partial migrants, where only some individuals of a species undertake the journey. Common examples include birds migrating south for winter, wildebeests crossing the Serengeti, and salmon swimming upstream to spawn. Migration plays a crucial role in ecosystem dynamics, influencing population structures, gene flow, and the survival of species in changing environments.