Gadwall vs American Black Duck

In short

The Gadwall and American Black Duck are both dabbling ducks, but they can be distinguished by their plumage and bill shape. Gadwalls have a more subdued coloration with a distinctive white speculum, while American Black Ducks are darker with a purplish speculum. Bill structure is also a key difference: Gadwalls have a thinner, more pointed bill compared to the broader, more robust bill of the American Black Duck.

Identification tips

1. Look for the white speculum on the Gadwall's wing, visible in flight or when preening. 2. Note the bill shape: Gadwalls have a thinner, more pointed bill, while American Black Ducks have a broader bill. 3. Observe the overall color: Gadwalls are lighter and more grayish, whereas American Black Ducks are darker brown. 4. In mixed flocks, Gadwalls may associate more with other species, while American Black Ducks often stay in more secluded areas.

Size

Both species are similar in size, but the American Black Duck may appear slightly bulkier.

Plumage

Gadwalls exhibit a subtle gray-brown plumage with a white speculum and black rump. In contrast, American Black Ducks have a darker overall appearance with a purplish speculum and a more uniform dark brown body.

Behaviour

Both species are dabblers, often seen tipping forward in the water to feed. Gadwalls may be slightly more social, often found in mixed flocks with other duck species.

Habitat

Gadwalls are found in a variety of wetland habitats, including marshes and ponds. American Black Ducks prefer more secluded and forested wetlands, often in coastal areas.

Voice

Gadwalls have a softer, more nasal quack compared to the louder, more forceful quack of the American Black Duck.