Migratory birds are species of birds that travel long distances between their breeding grounds and wintering grounds. This movement is seasonal, usually occurring annually or in a regular cycle. Migratory birds typically fly to warmer regions during the colder months to escape harsh weather conditions and find more favorable living conditions such as food and suitable nesting sites. Some of the most well-known migratory bird species include the Arctic Tern, which travels from the Arctic to the Antarctic each year, and the Sandhill Crane, which migrates between North America and Mexico. Migratory birds play an important role in ecosystems as they help disperse seeds, control insect populations, and serve as a food source for other animals.