Why do some birds migrate long distances?

Birds migrate long distances primarily to find food and suitable breeding grounds. Many species migrate to warmer climates during the winter months, where food sources are more abundant. Migration also allows birds to avoid harsh winter conditions and cold temperatures. Some birds, like the Arctic Tern, travel thousands of miles between the northern and southern hemispheres. Migration is instinctual and is typically triggered by changes in daylight length and temperature, which help birds determine when it’s time to begin their journey.