Why do some animals have a natural instinct to migrate?

Migration is an instinctive behavior that helps some animals find better living conditions, food, and breeding grounds. For example, birds migrate to warmer climates during the winter months to avoid food scarcity and harsh temperatures. Other animals, like caribou and wildebeests, migrate in search of better grazing areas or to reach breeding grounds. Migration is often triggered by environmental cues such as changes in daylight, temperature, and food availability, and it is essential for the survival of many species.