FIRST RECORD OF THE BLACK-TAILED GULL FOR MEXICO

Abstract

On 7 June 1997, we (along with Ted J. Nordhagen) observed an adult Black-tailed Gull (Larus crassirostris) at the fishing village of El Golfo de Santa Clara, near the mouth of the Colorado River in extreme northwestern Sonora, Mexico (31°42' N, 114°30' W).