Filter feeders, straining tiny plants or animals from the water. Order Anseriformes . Ducks, geese, and swans. Medium to large birds, typically water birds with webbed feet, male copulatory organ, hallux either absent or small and elevated. Bill lamellate in many species.
Tarsi scutellate in front.
Bill shape varies, flat in most species, often with internal lamellae, but long and hooked with serrate edge in mergansers. Diving ducks have a lobed hallux and lack iridescence in the speculum. Dabbling ducks have an unlobed hallux and often have an iridescent speculum. Order Falconiformes . Diurnal birds of prey.