Thayer's Gull (thayeri)

(last update: January 22, 2013)

Glaucous x Vega Gull hyperboreus x vegae (?) 1st cycle (1CY), December 26 2013, Cape Nosappu - Hokkaido, Japan. Picture: Ian Davies.

Visit: Ian's Picture on Flickr.

The nicely bicolored bill points to Glaucous and so is the pattern on coverts and tertials. But the primaries are pale brown. Some similarity to Thayer's Gull, but HYBRID GLAUCOUS GULL X VEGA GULL much larger with longer and stouter bill that often has brighter pinkish basally. Wingtip and tail pattern might resemble Thayer’s, but range of variation poorly known; should be separable by size and structure, especially bill.