The Trumpeter Swan (Cygnus buccinator) is a large white swan with a black bill and feet, distinguished from the similar Tundra Swan by its angular, V-shaped forehead and a pink or red line at the base of the bill. It inhabits wetlands with open water in temperate to polar climates and is currently listed as Least Concern.
Adult Trumpeter Swans are entirely white with black bills, feet, and tarsals. A key field mark is the small pink or red line, often called a 'grin,' at the base of the bill. While a small percentage of individuals may have a grey-white tint to their feathers, the standard adult plumage is pure white.
The most reliable way to distinguish a Trumpeter Swan from a Tundra Swan (Cygnus columbianus) is by viewing the bird face-forward or top-down. Trumpeter Swans have an angular, V-shaped forehead at the base of the beak, whereas Tundra Swans have a curved or straight forehead. Although most Tundra Swans have a yellow-white 'teardrop' on their black beak, this mark is not always present and is therefore less reliable than the forehead shape.
Juvenile cygnets are light to dark grey with bills that are black at the base but feature some degree of pink. Their feet and tarsi may be grey-yellow. Most cygnets turn white by age two, though a few feathers on the upper body may remain darker.
Trumpeter Swans live in close proximity to water, favoring wetlands with open water, rivers, or streams. They utilize salt, fresh, or brackish waters for feeding and nesting. Their climate range extends from temperate to polar regions.
According to AviList v2026, the species breeds in North America from western and central Alaska eastward through east-central Canada and southward through the western and central USA. Some individuals move southward in winter. Early extirpations and subsequent reintroductions have complicated the understanding of their precise distributional boundaries.
Trumpeter Swans are social and typically live in small family flocks. They are migratory, beginning a slow southward movement in late autumn (mid-October to late November) as weather cools. Common stopovers include Yellowstone National Park, parts of Wyoming, and North Dakota, where they remain until water freezes. They then move to warmer wintering regions such as Utah, Arizona, and the western coasts of Canada, Alaska, and Washington.
During the breeding season, Trumpeter Swans are highly territorial. They rarely leave their nests unguarded and may become aggressive toward competitors or perceived threats. Their daily routine varies seasonally; in winter, they rest more and eat less, while in spring, they are very active and consume large amounts of food.
Adult Trumpeter Swans are primarily herbivorous, feeding on aquatic plants such as tubers, roots, stems, and leaves. They forage underwater with their tails bobbing in the air or yank plants out of damp ground. In Alaska during the mating season, they consume large quantities of horsetail (Equisetum) and Lyngbye's sedge (Carex lyngbyei). Other regional diet variations include duck potato (Sagittaria latifolia), water weeds (Elodea), and pondweeds (Potamogeton).
Cygnets initially eat mostly aquatic invertebrates. By five weeks of age, most have converted to a nearly herbivorous diet similar to that of adults.
Trumpeter Swans are monogamous and mate for life. Courtship displays involve synchronized wing spreading, quivering, head bobbing, and trumpeting. Mating usually occurs from March to May, with adults beginning to breed at 4 to 7 years of age.
Both parents contribute to building large nests of aquatic vegetation, grasses, and sedges, which can range from 1.2 to 3.6 meters in diameter. These nests are usually surrounded by water. The female lays 4 to 6 eggs and performs the majority of incubation, which lasts 32 to 37 days. Unlike many birds, Trumpeter Swans do not have a specialized brood patch and instead incubate the eggs using their feet. Both parents care for the precocial cygnets throughout their first year.
The Trumpeter Swan is known for its distinctive low bugle call, which is used to warn flocks of impending danger. They also use visual signals, such as head bobbing, to alert others of disturbances or in preparation for flight. Breeding pairs perform synchronous visual displays that likely reinforce their pair bond. Pheromones are also used in mating rituals, with the female emitting them when ready to mate.
The Trumpeter Swan is currently listed as Least Concern (LC) in AviList v2026. Historically, the species was heavily harvested for decorative feathers and skins, leading to significant population declines. Today, habitat destruction is considered a major threat, and illegal hunting remains a concern, with lead poisoning from embedded bullets affecting birds that do not die immediately from gunshot wounds.
Reintroduction programs in many states have helped restore populations. However, the species faces competition from invasive Mute Swans, which are more aggressive and can displace native Trumpeter Swans from shared wetland habitats. Some states have implemented Mute Swan control programs to mitigate this impact. As migratory birds, Trumpeter Swans are protected under the United States Migratory Bird Act.
When observing Trumpeter Swans, maintain a safe distance to avoid stressing the birds, especially during the breeding season when they are highly territorial. Look for them in wetlands with open water, focusing on the shape of the forehead and the color of the bill base to confirm identification. Listening for the low bugle call can also help locate flocks in dense vegetation or on large bodies of water.
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