Waterfowl Bird Identification

Geese can be identified by their V-shaped flight formation.

Waterfowl in the United States include dabbling ducks, diving ducks, geese and swans. Identifying one species from the other can be tricky. Males and females sometimes differ in appearance, and birds' plumage colors may vary throughout the year. There are several clues for identifying waterfowl; you will probably need to consider more than one to make a positive ID of the bird you're observing.

Habitat

You can get a good start on identifying a bird if you know where it likes to live. Some waterfowl prefer the western part of the continent and some live only in the East. Some venture out of Canada only during migration. Habitat can also be a clue on a smaller scale. For example, if you see a duck in a marsh or small pond, it is a dabbling duck. Diving ducks prefer deeper water, and they are seen on large rivers, lakes or the ocean.

Size

Swans are the largest species of waterfowl.

Waterfowl range in size from trumpeter swans (28 lbs.) to harlequin ducks (18 oz.) and everything in between. If you look at waterfowl often, you'll recognize that most geese are larger than most ducks. But if you're not sure whether you're observing a brant (a goose) or a merganser (a duck), you'll need more clues.

Shape

Body and wing shape help to identify a bird. Both swans and geese have long necks that are easily visible when they are in flight. Dabbling ducks swim high in the water and walk around in parks and fields looking for food. Diving ducks' feet are set far back on their bodies. They look awkward on the land and may have to "run" across the surface of the water to get airborne.

Color

The mallard drake has a distinctive, iridescent green head.

Each species of waterfowl has distinctive markings, but some are so similar you might need a close look to make a final identification. Consult a birders' guide and look for colors and markings on the wings, head and breast.

Sound

The sound a bird makes can be an important piece of the identification puzzle. For example, if you're unsure whether the large white bird on the lake is a trumpeter swan or tundra swan, use your ears. The trumpeter swan honks out a low, drawn-out note and the tundra swan makes a short, high-pitched cry. Some online resources for birders include recordings of bird calls to aid in identification (see Resources).

Flight Formation

Even if you only see birds in distant flight, the way they fly can be a clue to their identity. Geese are recognized by the well-defined V pattern they form in flight. Mallards and other puddle ducks fly in disorganized flocks. Diving ducks fly in single file or irregular V patterns.

References

• U.S. Geological Survey: Waterfowl Identification Guide
• NYS Department of Environmental Conservation: Identifying New York State Waterfowl
• International Hunter Education Association: Guide to Wildlife Identification

Resources

• The Cornell Lab of Ornithology: All About Birds