Kelp Gull vs Great Black-backed Gull

In short

The Kelp Gull and Great Black-backed Gull are both large, dark-backed gulls, but they can be distinguished by size and bill characteristics. The Great Black-backed Gull is notably larger with a thicker bill, while the Kelp Gull has a more slender bill and slightly smaller size.

Identification tips

1. Size: Look for the larger size of the Great Black-backed Gull. 2. Bill: Note the thicker bill of the Great Black-backed Gull compared to the more slender bill of the Kelp Gull. 3. Back Color: Observe the back color; the Great Black-backed Gull has a deeper black back. 4. Location: Consider geographical location; Great Black-backed Gulls are more common in the North Atlantic, while Kelp Gulls are found in the Southern Hemisphere.

Size

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

Plumage

Both species have dark backs, but the Great Black-backed Gull's back is a deeper black compared to the dark gray of the Kelp Gull. The Kelp Gull may show a more contrasting white head, especially in adults.

Behaviour

Both species are opportunistic feeders, but the Great Black-backed Gull is known for its aggressive behavior, often displacing other gulls.

Habitat

The Great Black-backed Gull is typically found in the North Atlantic, often near human refuse sites, while the Kelp Gull is more widespread in the Southern Hemisphere, often near coastal areas.

Voice

Vocalizations are not a primary distinguishing feature between these two species.