Caspian Gull vs Caspian Tern

In short

The Caspian Gull and Caspian Tern can be distinguished by their size and bill shape. The Caspian Gull is a large gull with a robust yellow bill, while the Caspian Tern is the largest tern with a distinctive thick red bill. Observing their behavior and habitat preferences can also aid in identification.

Identification tips

1. Look for the bill shape and color: Caspian Gulls have a yellow bill, while Caspian Terns have a thick red bill. 2. Observe flight style: Caspian Terns soar with slow wing beats, while Caspian Gulls have a more direct flight. 3. Note habitat: Caspian Terns are more likely to be seen over open water, diving for fish. 4. Listen for calls: Caspian Terns have a distinctive loud call, especially in colonies.

Size

The Caspian Gull is a large gull, but the Caspian Tern is the largest of the terns, appearing more streamlined in flight.

Plumage

Caspian Gulls have a pale grey back and wings with black wingtips, while Caspian Terns have a white body with a black cap and grey wings. The tern's plumage is more uniform with less contrast between the back and wings.

Behaviour

Caspian Terns are often seen plunge-diving for fish, while Caspian Gulls typically scavenge and are less likely to dive. Terns have a more graceful flight with slower wing beats compared to the gull's more direct flight.

Habitat

Caspian Gulls are found in a variety of coastal and inland water habitats, often near human activity. Caspian Terns prefer open water habitats such as lakes, rivers, and coastal areas, often nesting on sandy or rocky islands.

Voice

Caspian Terns have a loud, raucous call often heard in colonies, while Caspian Gulls have a typical gull-like call that is less harsh.