Thayer's gull breeds in the Arctic islands of Canada and winters on the Pacific coast from southern Alaska to the Gulf of California. While in Puerto Penasco, Mexico, on the northern portion of the Gulf of California, we encountered some second year immature Thayer's gulls.
|Second year wintering immature Thayer's gull.|
|Note the pale gray upper back and the brown mottling on the breast and neck.|
|This bird has no mottling on the neck or breast and the feet and legs are a little lighter.|
|This out-of-focus shot shows the light gray back.|