Gaviota de Delaware vs Gaviota del Caspio

The Ring-billed Gull and Caspian Gull can be distinguished by their bill markings and overall structure. The Ring-billed Gull has a distinctive black ring near the tip of its bill, while the Caspian Gull typically lacks this feature. Additionally, the Caspian Gull is generally larger and more robust in structure compared to the more delicate Ring-billed Gull.

Look for the black ring on the bill of the Ring-billed Gull. Compare overall size and structure, as the Caspian Gull is larger and more robust.

The Caspian Gull is generally larger and more robust than the Ring-billed Gull.

The Ring-billed Gull has a distinctive black ring near the tip of its bill, which is not present in the Caspian Gull.