Herring Gull vs Great Black-backed Gull

In short

The Great Black-backed Gull is notably larger and more robust than the Herring Gull, with a striking black back and wings compared to the Herring Gull's gray. Both species are common in coastal areas, but the Great Black-backed Gull is more dominant and aggressive.

Identification tips

1. Size: Look for the larger size and bulkier build of the Great Black-backed Gull. 2. Plumage: Note the black back and wings of the Great Black-backed Gull versus the gray of the Herring Gull. 3. Behavior: Observe interactions; Great Black-backed Gulls are more dominant. 4. Habitat: Check nesting sites; Great Black-backed Gulls prefer more isolated locations.

Size

The Great Black-backed Gull is the largest gull in the world, significantly larger and bulkier than the Herring Gull.

Plumage

The Great Black-backed Gull has a black back and wings, while the Herring Gull has a gray back and wings. Both have white heads and underparts, but the Great Black-backed Gull's darker upperparts are a key distinguishing feature.

Behaviour

Great Black-backed Gulls are more aggressive and often displace Herring Gulls from feeding and nesting areas. Both are opportunistic feeders, but the Great Black-backed Gull is more likely to prey on other birds.

Habitat

Both species are found in coastal regions, but the Great Black-backed Gull often prefers more isolated nesting sites like islands and offshore rocks.

Voice

Vocalizations are similar, with both species producing loud, harsh calls. Distinguishing them by sound alone can be challenging.