Canvasback

Habitat

Canvasbacks breed in shallow prairie lakes and ponds with marshy shorelines, especially those with bulrush. They typically inhabit large lakes during migration. In winter they frequent sheltered lakes, saltwater bays, and estuaries. They also use sewage lagoons.

Behavior

In winter Canvasbacks gather in large flocks, often mixed with scaups. As divers, Canvasbacks usually find food under water but will also feed at the surface. Canvasbacks, like most other North American ducks, are seasonally monogamous. Most pairs form at stopover points during spring migration.

Diet

The bases and roots of aquatic plants, as well as some leaves and seeds, make up the majority of the Canvasback's diet. Wild celery is particularly favored. Mollusks, aquatic insects, and some small fish are also eaten, especially by nesting females and young.

Nesting

The nest, built by the female, is situated in dense emergent vegetation above shallow water, and sometimes on dry ground. It is a bulky bowl of vegetation lined with down. The female lays and incubates 8 to 10 eggs for 24 to 29 days. Several hours after the young hatch, the female leads them to open water where they feed themselves. They are tended by the female for several weeks. The male leaves during incubation, and the female leaves several weeks after the young hatch. The ducklings are left to fend for themselves until they can fly, at about 60 to 70 days.

Migration Status

Canvasbacks migrate late in fall and early in spring. Birds migrate in flocks, in a V-formation. Migration is relatively quick in the spring, but more drawn out in fall, lasting from late August to November.

Conservation Status

Although numbers vary considerably from year to year, the overall trend is one of long-term decline, mostly due to habitat loss. In fact, hunting seasons were closed in the Atlantic Flyway in the mid-1990s to allow recovery of very low population levels. In order to reverse this trend, the loss and degradation of wetlands needs to be arrested. The breeding range in Washington, which is at the southern edge of the North American breeding range, appears to be shrinking, and some areas that look like suitable habitat do not have nesting Canvasbacks. In these areas, Redheads may outcompete Canvasbacks.

When and Where to Find in Washington

Canvasbacks breed in eastern Washington at Potholes Reservoir and Winchester Wasteway (Grant County), at Turnbull National Wildlife Refuge (Spokane County), and in Okanogan County. Confirmed nesting records from the last ten years are limited to these three counties, although summer sightings of non-breeders may occur in appropriate habitat throughout the state. The Canvasback is a common migrant, appearing in late August at the earliest and becoming more common in October through November. In winter, Canvasbacks are found in lowlands west of the Cascades as well as in eastern Washington, although they are more common on salt water during the winter than on fresh water. They typically leave the wintering grounds in mid-April. Seward Park in Seattle is an excellent place to find wintering Canvasbacks.

Washington Range Map