Found inland with Lessers during migration however. Population about 500,000. Peak nesting occurs in June. Major migration routes take fall birds SE across Canada to Atlantic coast from Maine to Florida. Some migrate down west coast to California.
Tundra is a more stable breeding area than Prairies, less subject to drought.
Shorter nesting season however. Nest on upland sites within walking distance to water. Hens mix their broods. Many are abandoned while still in down, but picked up by other hens. Most migrate in fall down Mississippi and Central flyways to Gulf coast and Mexico.