Ring-billed Gull vs Kelp Gull

In short

The Ring-billed Gull (Larus delawarensis) and Kelp Gull (Larus dominicanus) can be distinguished by bill markings and size. The Ring-billed Gull has a distinctive black ring around its yellow bill, while the Kelp Gull has a solid yellow bill. Size and plumage differences are also notable.

Identification tips

1. Look for the black ring on the bill of the Ring-billed Gull. 2. Note the size difference: Kelp Gulls are larger. 3. Compare mantle color: Ring-billed Gulls have a lighter gray mantle. 4. Observe habitat: Ring-billed Gulls are more likely inland, Kelp Gulls near coasts. 5. Check wingtip patterns: Kelp Gulls have black wingtips with white spots.

Size

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

Plumage

Ring-billed Gulls have a lighter gray mantle compared to the darker gray or blackish mantle of the Kelp Gull. Both species have white underparts, but the Kelp Gull's wingtips are black with white spots, whereas the Ring-billed Gull's wingtips are more uniformly black.

Behaviour

Both species exhibit typical gull behavior, such as scavenging and opportunistic feeding, but the Kelp Gull may be more aggressive in its feeding habits.

Habitat

Ring-billed Gulls are commonly found in inland areas and near freshwater bodies, while Kelp Gulls are more coastal and often found near marine environments.

Voice

Both species have similar gull-like calls, but specific vocalizations are not well-documented for field differentiation.