Yellow-legged Gull vs Great Black-backed Gull

In short

The Yellow-legged Gull and the Great Black-backed Gull can be distinguished by size and coloration. The Great Black-backed Gull is notably larger and has a darker back compared to the Yellow-legged Gull's lighter gray back. Both species are opportunistic feeders, but their habitats and behaviors offer additional clues.

Identification tips

• Size: Look for the larger size of the Great Black-backed Gull.
• Back Color: Note the dark slate-black back of the Great Black-backed Gull versus the light gray back of the Yellow-legged Gull.
• Leg Color: Check for yellow legs on the Yellow-legged Gull and pink legs on the Great Black-backed Gull.
• Habitat: Consider the location; urban areas may favor Yellow-legged Gulls, while remote coastal areas may indicate Great Black-backed Gulls.

Size

The Great Black-backed Gull is the largest gull species, significantly larger than the Yellow-legged Gull.

Plumage

The Great Black-backed Gull has a dark slate-black back and wings, while the Yellow-legged Gull has a light gray back. Both have white underparts, but the Yellow-legged Gull has yellow legs, whereas the Great Black-backed Gull has pink legs.

Behaviour

Both species are opportunistic feeders, but the Great Black-backed Gull often preys on other birds and their chicks, while the Yellow-legged Gull is more likely to be seen scavenging in urban areas.

Habitat

Yellow-legged Gulls are often found in coastal areas and urban environments, including rooftops in large cities. Great Black-backed Gulls prefer coastal regions, nesting on islands or offshore rocks.

Voice

Vocalizations are not a primary distinguishing feature between these species, as both have similar gull-like calls.