Lesser Black-backed Gull vs Slaty-backed Gull

In short

The Lesser Black-backed Gull and Slaty-backed Gull can be distinguished by their back color and size. The Lesser Black-backed Gull has a darker slate-gray back, while the Slaty-backed Gull is larger with a paler gray back. Observing these differences can help in identification.

Identification tips

1. Back color: Look for the darker slate-gray back of the Lesser Black-backed Gull versus the paler gray of the Slaty-backed Gull. 2. Size and bulk: Note the larger size and bulkier build of the Slaty-backed Gull. 3. Seasonal plumage: In winter, the Slaty-backed Gull may show a more contrasting white head. 4. Location: Consider the habitat, with the Slaty-backed Gull more likely in northern Pacific regions.

Size

The Slaty-backed Gull is generally larger and bulkier than the Lesser Black-backed Gull.

Plumage

The Lesser Black-backed Gull has a darker slate-gray back compared to the paler gray back of the Slaty-backed Gull. Both species have white heads and underparts, but the Slaty-backed Gull often shows a more contrasting white head in winter.

Behaviour

Both species exhibit similar gull-like behaviors, including scavenging and foraging along coastlines and open waters.

Habitat

The Lesser Black-backed Gull is often found in coastal regions and inland waters, while the Slaty-backed Gull is more typically associated with northern Pacific coasts.

Voice

Both species have similar gull-like calls, but specific vocal differences are not well-documented.