Herring Gull (argentatus & argenteus)

(last update: February 11, 2013)

Slaty-backed Gull schistisagus 3rd cycle (4CY), January 02 2010, Choshi, Japan. Picture: Chris Gibbins.

Upperpart grey tone as in Lesser Black-backed Gull, clean yellow iris, and almost completely white tail. Mirror on P10. Note very broad white tips of tertials, which continues on the tips of the secondaries.