Pallas's Gull vs Common Gull

In short

Pallas's Gull and Common Gull can be distinguished by size and bill structure. Pallas's Gull is notably larger with a heavier, more robust bill, while the Common Gull is medium-sized with a more delicate bill. Both species have similar gray and white plumage, making structural differences key for identification.

Identification tips

1. Size and Structure: Look for the larger size and heavier bill of Pallas's Gull. 2. Head and Primary Markings: In breeding season, Pallas's Gull has a black head, while Common Gull does not. 3. Wing Pattern: Check for more extensive black on the primaries of Pallas's Gull. 4. Behavior: Observe any aggressive behavior, which may suggest Pallas's Gull. 5. Habitat: Consider the habitat; Pallas's Gull prefers larger water bodies.

Size

Pallas's Gull is significantly larger than the Common Gull, with a bulkier build and longer wingspan.

Plumage

Both species have gray mantles and white underparts, but Pallas's Gull has a more striking black head in breeding plumage and more extensive black on the primaries. The Common Gull's plumage is more uniform with less contrast.

Behaviour

Both species exhibit typical gull behaviors such as scavenging and opportunistic feeding, but Pallas's Gull may be more aggressive due to its larger size.

Habitat

Pallas's Gull is often found in coastal and inland water bodies across its range, while the Common Gull is more widespread, inhabiting a variety of habitats including coastal areas, lakes, and rivers.

Voice

Vocalizations are not the most reliable distinguishing feature as both species have typical gull-like calls, but Pallas's Gull may have deeper, more resonant calls.