Thayer's/Kumlien's Gull Larus thayeri/g.kumlieni
March 7th 2005 Choshi Chiba Japan
The size seemed to be approaching to Black-tailed Gulls.
Compare the bill size with the Vega Gull on right.
Comparison with an adult Vega Gull.
In flight, it seemingly appeared like a minimum-sized Glaucous-winged Gull because of the coloration from a distance, though particularly the bill looked too small.