Family: AnatidaeHabitat: Found in freshwater lakes, marshes, and rivers with slow-moving waters with emergent vegetation; occasionally in brackish waters (A.O.U. 1998).
Distribution: Breeding range extends from Alaska south to northern British Columbia, southwestern Mackenzie, northwestern Alberta, western and central Montana, and southern Saskatchewan (local breeder within this range); formerly bred as far south as the mid-Western United States. Wintering range extends from southern Alaska south to California; also in Arizona, New Mexico, and east to Colorado and Minnesota (A.O.U. 1998). The Trumpeter Swan has been introduced and established in many additional locations.
Field Marks: Black bill with no yellow spot (as in Tundra Swan). Black at base of bill extends to encompass the eye (compare closely with Tundra Swan).
Nest Habits: Nest built of aquatic vegetation, is often placed on muskrat houses or beaver lodges; also may be placed along shoreline.
Eggs: 2-13, usually 4-6; 111 millimeter; creamy-white in color.
Incubation: Females incubate the eggs; both sexes care for the young. Incubation lasts approximately 33-37 days; young are capable of flight when they are about 91-119 days old.
