Caspian Gull vs Armenian Gull

In short

Caspian Gull and Armenian Gull are similar large gulls, but they can be distinguished by subtle differences in structure and plumage. Caspian Gull typically has a longer bill and more elongated body, while Armenian Gull shows a more compact structure with a shorter bill. Observing primary projection and leg color can also aid in identification.

Identification tips

1. Bill Shape: Caspian Gull has a longer, more slender bill; Armenian Gull's bill is shorter and stubbier. 2. Primary Projection: Caspian Gull shows longer primary projection beyond the tail. 3. Leg Color: Caspian Gull typically has paler legs, while Armenian Gull's legs are often more yellowish. 4. Mantle Color: Look for a paler mantle in Caspian Gull compared to the darker mantle of Armenian Gull. 5. Head Streaking: In nonbreeding plumage, Armenian Gull may show more pronounced head streaking.

Size

Caspian Gull is generally larger with a longer bill and more elongated body compared to the more compact Armenian Gull.

Plumage

Caspian Gull often has a paler mantle and more extensive white on the wingtips. Armenian Gull tends to have a darker mantle and less white on the wingtips. In nonbreeding adults, Armenian Gull may show a more distinct head streaking.

Habitat

Both species can be found in similar habitats, such as coastal areas and large inland water bodies, but Armenian Gull is more restricted to the Caucasus and surrounding regions.