The United States Fish and Wildlife Service coordinates several surveys that collect information on the population status of migratory birds in North America. The North American Breeding Bird Survey is the primary source of population information on nongame birds during the breeding season, and waterfowl surveys are conducted during breeding and wintering seasons. The surveys are international in scope, based upon research into sampling methods for birds, and used in management of migratory birds. The Service also maintains the Bird Banding Laboratory in cooperation with the Canadan Wildlife Service, and supports demographic monitoring of bird populations.