The term for the migration of birds ahead of winter is called "migration." Many bird species migrate to warmer climates during the colder months to access more abundant food resources and suitable nesting conditions. This seasonal movement is often prompted by changes in temperature, daylight, and food availability. Birds typically follow established migration routes and may travel thousands of miles to reach their wintering grounds. Common indicators of migration include changes in flock behavior and vocalizations. Notable migratory species include the Arctic Tern and the Canada Goose, which are known for their long journeys.