Lesser Black-backed Gull vs California Gull

In short

The Lesser Black-backed Gull and California Gull can be distinguished by their size, mantle color, and leg color. Lesser Black-backed Gulls have darker mantles and yellow legs, while California Gulls have lighter mantles and greenish-yellow legs. Both species have similar overall structure, but size and coloration are key differentiators.

Identification tips

1. Check leg color: Lesser Black-backed Gulls have yellow legs, while California Gulls have greenish-yellow legs. 2. Observe mantle color: Lesser Black-backed Gulls have a darker gray mantle. 3. Consider location: Lesser Black-backed Gulls are more coastal and European, whereas California Gulls are more inland and North American.

Size

Lesser Black-backed Gulls are generally smaller and more slender than California Gulls.

Plumage

Lesser Black-backed Gulls have a darker gray mantle compared to the lighter gray mantle of California Gulls. Both species have white heads and underparts, but the mantle color is a key distinguishing feature.

Behaviour

Both species exhibit typical gull behavior, including scavenging and foraging in flocks. Behavior alone is not a reliable differentiator.

Habitat

Lesser Black-backed Gulls are more commonly found in coastal regions and often in Europe, while California Gulls are more widespread in North America, especially inland and around large lakes.

Voice

Vocalizations are similar and not a reliable field mark for distinguishing these species.