Gaviota del Caspio vs Gavión Atlántico

The Caspian Gull and Great Black-backed Gull can be distinguished primarily by size and plumage. The Great Black-backed Gull is notably larger with a darker back, while the Caspian Gull is smaller with a lighter gray back. Observing these differences in the field can help birdwatchers accurately identify these species.

Size: Look for the larger size of the Great Black-backed Gull. Plumage: Note the dark back of the Great Black-backed Gull compared to the lighter gray back of the Caspian Gull.

The Great Black-backed Gull is significantly larger than the Caspian Gull.

The Great Black-backed Gull has a dark, almost black back, whereas the Caspian Gull has a lighter gray back.