Gadwall vs Lesser Scaup

In short

The Gadwall and Lesser Scaup are both dabbling ducks, but they can be distinguished by their structure and plumage. The Gadwall has a more slender bill and a subtle plumage pattern, while the Lesser Scaup has a distinct head shape and contrasting plumage. Both species are found in similar wetland habitats, but their behaviors and vocalizations can help differentiate them.

Identification tips

1. Look for the Gadwall's white speculum in flight, which contrasts with the Lesser Scaup's darker wing. 2. Note the head shape: Gadwalls have a more rounded head, while Lesser Scaups have a peak at the back of the head. 3. Observe feeding behavior: Gadwalls dabble, Lesser Scaups dive. 4. Compare plumage: Gadwalls are more uniformly gray-brown; male Lesser Scaups have a striking black and white contrast.

Size

Both species are medium-sized ducks, but the Gadwall is slightly larger and bulkier than the Lesser Scaup.

Plumage

The Gadwall has a more understated plumage with a gray-brown body and a white speculum visible in flight. The male Lesser Scaup has a striking black head, chest, and rear with a white body, while females are brown with a white patch near the bill.

Behaviour

Gadwalls are often seen dabbling at the water's surface, while Lesser Scaups are more likely to dive for food. This difference in feeding behavior can be a useful clue.

Habitat

Both species inhabit wetlands, but Gadwalls are more commonly found in shallow marshes and ponds, whereas Lesser Scaups prefer deeper lakes and reservoirs.

Voice

Gadwalls have a soft, nasal quack, while Lesser Scaups produce a quieter, more guttural call. These vocal differences can be subtle and are not always reliable for identification.