Gadwall vs Black-vented Shearwater

In short

Gadwall and Black-vented Shearwater are easily distinguished by habitat and structure: Gadwalls are freshwater ducks with a distinctive white speculum, while Black-vented Shearwaters are seabirds with long wings adapted for gliding. Observing the environment and flight behavior will quickly separate these species.

Identification tips

1. Habitat: Gadwalls are in freshwater environments; Black-vented Shearwaters are at sea. 2. Wing Pattern: Look for the white speculum on Gadwalls in flight. 3. Behavior: Dabbling versus gliding flight. 4. Plumage: Gadwalls have a more uniform gray-brown appearance, while shearwaters have a stark dark-and-light contrast. 5. Vocalizations: Listen for quacks from Gadwalls and nasal calls from shearwaters.

Size

Gadwalls are medium-sized ducks, whereas Black-vented Shearwaters are smaller seabirds, though both can appear similar in size from a distance.

Plumage

Gadwalls have a subtle, mottled gray-brown plumage with a white wing patch visible in flight. Black-vented Shearwaters have a contrasting dark upper side and white underside, typical of many seabirds.

Behaviour

Gadwalls are dabbling ducks, often seen tipping forward in water to feed. Black-vented Shearwaters are pelagic, often seen gliding low over the ocean surface.

Habitat

Gadwalls are found in freshwater wetlands, ponds, and lakes. Black-vented Shearwaters inhabit coastal and offshore marine environments.

Voice

Gadwalls have a soft quacking call, while Black-vented Shearwaters produce a variety of harsh, nasal calls, often heard at night near breeding colonies.