In fall, some eastern populations of leasts make nonstop 1,800-to-2,500-mile flights over the Atlantic Ocean between New England and northeastern South America. Western populations such as ours move in shorter hops, migrating through interior North America to the gulf coast or Central America, or along the Pacific Coast to South America. Spring migration for all populations is through North America. Least sandpipers breed in subarctic tundra and northern boreal forests across northern North America. Look for these tiny, yellow-legged sandpipers amongst flocks of western and semipalmated sandpipers and dunlin.