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The Swallow-tailed Gull is an equatorial seabird in the gull family Laridae. The species is endemic to the Galapagos Islands. The Swallow-tailed Gull has a very distinctive black head with a red ring around its eye. It has a black bill with a grey tip.
The Swallow-tailed Gull is equally at home on cliffs, sand and rough lava deposits. Cliff ledges appear to be the gull’s most successful breeding ground and nesting habitat. It frequents all of the Galapagos Islands, except Fernandina. After breeding in the Galapagos, the gulls fly east into Ecuador and Peru. Some occasionally travel into Panama.