Ring-billed Gull vs Caspian Gull

In short

The Ring-billed Gull (Larus delawarensis) and Caspian Gull (Larus cachinnans) can be distinguished by bill markings and size. The Ring-billed Gull has a distinctive black ring around its bill, while the Caspian Gull typically lacks this feature. Observing these species in their respective habitats can also aid identification.

Identification tips

1. Look for the black ring on the bill of the Ring-billed Gull. 2. Note the larger size and lack of bill ring in the Caspian Gull. 3. Observe the habitat: Ring-billed Gulls are more common in North America, while Caspian Gulls are found in Eurasia.

Size

The Caspian Gull is generally larger and more robust than the Ring-billed Gull.

Plumage

Ring-billed Gulls have a black ring around their bill and a more uniform gray mantle. Caspian Gulls have a paler gray mantle and lack the black ring on the bill.

Behaviour

Both species exhibit typical gull behaviors such as scavenging and loafing near water, but the Caspian Gull may appear more solitary.

Habitat

Ring-billed Gulls are commonly found in North America near lakes, rivers, and coastal areas. Caspian Gulls are more widespread in Eurasia, often found in inland water bodies and coastal regions.

Voice

Vocalizations are not a primary distinguishing feature between these two species.