Common Gull vs California Gull

In short

The Common Gull (Larus canus) and California Gull (Larus californicus) can be distinguished by their size and bill characteristics. Common Gulls are generally smaller with a more delicate bill, while California Gulls are larger with a heavier bill. Both species have similar gray mantles, but the Common Gull typically has darker eyes.

Identification tips

1. Size and Structure: Look for the smaller size and more delicate bill of the Common Gull compared to the larger, heavier-billed California Gull. 2. Eye Color: Common Gulls generally have darker eyes. 3. Primary Wing Pattern: Check for the presence of white spots on the primaries; Common Gulls often lack these, while California Gulls usually have them.

Size

Common Gulls are medium-sized and slightly smaller than California Gulls, which are larger and more robust.

Plumage

Both species have gray mantles, but the Common Gull's mantle is medium to pale gray, often paler than that of the California Gull. The Common Gull usually lacks a white spot between gray and black on the primaries, whereas the California Gull often shows this feature. Common Gulls have darker eyes compared to the California Gull.