Caspian Gull vs Herring Gull

In short

The Caspian Gull and Herring Gull are similar large gulls, but the Caspian Gull typically has a longer, more slender bill and a more upright posture. The Herring Gull generally has a bulkier build and a more robust bill. Observing the wing-tip pattern and leg color can also help differentiate them.

Identification tips

• Bill Shape: Caspian Gull has a longer, more slender bill; Herring Gull's bill is bulkier.
• Wing-tip Pattern: Caspian Gull shows more white on the outer primaries.
• Leg Color: Caspian Gull often has paler legs.
• Posture: Caspian Gull stands more upright.
• Call: Listen for the more melodious call of the Caspian Gull.

Size

Both species are large gulls, but the Caspian Gull often appears slightly more slender and elongated, whereas the Herring Gull is bulkier.

Plumage

Caspian Gulls have paler upperparts and a more extensive white tip on the outer primaries. Herring Gulls show darker gray upperparts and less white on the wing-tips. Leg color can also differ, with Caspian often showing paler legs.

Behaviour

Caspian Gulls often stand more upright and have a more elegant posture compared to the more horizontal stance of Herring Gulls.

Habitat

Both species can be found in similar habitats, such as coastal areas and large inland water bodies, but Caspian Gulls are more likely to be found in eastern Europe and Central Asia, while Herring Gulls are widespread in northern Europe.

Voice

Caspian Gulls have a distinctively different call, often described as a more melodious 'laughing' sound compared to the harsher calls of the Herring Gull.