Ivory Gull vs Slender-billed Gull

In short

The Ivory Gull is a striking all-white bird with a stout bill and shorter legs, often found in polar pack-ice habitats. In contrast, the Slender-billed Gull has a more delicate appearance with a longer, thinner bill and is typically seen in warmer, coastal environments.

Identification tips

1. Plumage: Look for the all-white plumage of the Ivory Gull. 2. Bill: Note the stout bill of the Ivory Gull versus the slender bill of the Slender-billed Gull. 3. Habitat: Consider the habitat; Ivory Gulls are in Arctic regions, while Slender-billed Gulls are in warmer, coastal areas. 4. Legs: The Ivory Gull has shorter legs compared to the Slender-billed Gull.

Size

Both species are similar in size, but the Ivory Gull has a more robust build compared to the more delicate Slender-billed Gull.

Plumage

The Ivory Gull is entirely white, which is a key distinguishing feature. The Slender-billed Gull, while also pale, has a light grey back and wings, and a white head, which can appear slightly pinkish during the breeding season.

Behaviour

Ivory Gulls are aggressive and opportunistic feeders, often seen foraging within pack ice. Slender-billed Gulls are more likely to be observed in coastal areas, feeding on small fish and invertebrates.

Habitat

Ivory Gulls are found in Arctic regions, particularly around pack ice. Slender-billed Gulls prefer warmer, coastal habitats, often in the Mediterranean and parts of Africa and Asia.

Voice

Vocalizations are not a primary distinguishing feature between these two species, and specific differences are not well-documented.