Canvasbacks are North America’s largest diving ducks. Their common name is derived from the breeding male’s canvas-colored white body. When selecting their wintering grounds, they look for large bodies of water with large amounts of submerged aquatic vegetation.

Physical Description

Like other birds, these large diving ducks exhibit seasonal and sexual dimorphism, meaning their feather color changes based on the season. Male canvasbacks have white bodies, black chests and tails, and a chestnut head during the breeding season. For the rest of the year, the males’ colors are more brown throughout. Females have pale, off-white bodies and gray-brown bodies and tails. 

Canvasbacks’ black bills seamlessly line up with their long, narrow and sloping heads.

Size

Canvasbacks are the largest diving duck in North America. They are roughly 20 to 21 inches (50 to 53 centimeters) long and have a 31 to 35 inch (79 to 89 centimeter) wingspan. Both males and females on average weigh between 2.5 and 2.7 pounds (1.13 and 1.22 kilograms), with males being slightly larger.

Native Habitat

During their spring and summer breeding season, canvasbacks are among many species of waterfowl that flock to North America’s flooded northern prairies, sometimes called the Prairie Pothole region. This region is part of the Great Plains and primarily focuses in the Upper Midwestern U.S. Here, these ducks live in temperate grasslands that are seasonally flooded with melted snow and spring rains, forming "potholes" of water that dot the landscape.

These ducks then fly south in the fall. They primarily winter on California or Texas coasts, or in northern to central Mexico. When selecting their wintering grounds, canvasbacks look for large bodies of water that contain large amounts of submerged aquatic vegetation. Historically, canvasbacks would also winter in the Chesapeake Bay. However, the continuing decrease of this favored food source has led to fewer ducks wintering there. 

Communication

Canvasbacks are not particularly loud ducks. Males will make a soft cooing vocalization to the females, who will answer with a soft “krrr krrr” sound.

Food/Eating Habits

Primarily diving for their food, canvasbacks mostly eat aquatic plants’ leaves, roots and seeds. Their preferred food is a plant called Valisineria americana, which is more commonly called celery root or wild celery. These diving ducks have also been known to eat mollusks, clams, insects and some small fish.

Social Structure

Canvasbacks are social birds when not breeding. They are often seen gathering in large flocks with other medium-to-large diving ducks like redheads and scaups during the winter.

Courtship and pair formation mostly occurs at stopover points throughout the canvasback’s spring migration. Canvasbacks are seasonally monogamous. After a female chooses her mate, they will stay together until the fall migration.

Conservation Efforts

In the 19th century, canvasbacks were heavily hunted for food. Hunters believe celery root, the canvasback’s favored food, made these ducks one of the most delicious game birds. Commercial market hunting almost drove canvasbacks to extinction. The Migratory Bird Treaty Act of 1918 was the first step toward saving this bird, as it outlawed market hunting.

Wetland habitat loss is another threat to canvasbacks and other diving ducks. Proceeds from the Duck Stamp, which must be purchased by every duck hunter in the United States, go toward conserving these wetland habitats.

Animal News

Aspen and Juniper: A Beaver Love Story

February 09, 2024

Public Can Help Name Cotton-Top Tamarins at the Smithsonian’s National Zoo and Conservation Biology Institute

February 05, 2024

White-Naped Crane Dies at the Smithsonian’s National Zoo and Conservation Biology Institute

January 31, 2024