Thayer's Gulls Larus thayers
28th 2012 Choshi Chiba Japan
I counted 16 Thayer's
Gulls (including some presumed thayeri-kumlieni
intergrades/hybrids) in one day. Gulls in Choshi are decreasing in these years,
but strangely Thayer's Gulls clearly seem to be increasing. This page shows
10 1st winter birds.
Dark individual with plain gray replaced
Dark individual somewhat resembling
large individual (male?).
Quite small individual (female?). Looks
very fresh, and close to juvenile plumage. Only a few replaced
scapulars are visible.
The smallest individual in center is above-mentioned
"I". "J" is standing behind. The large individual in the foreground is
Slaty-backed Gull. Thayer's Gulls usually can be picked out by their
"uniform and smallish" looks among Vega and Slaty-backed Gulls.