Slaty-backed Gull
Fig 1) Note the smudge around the eye; Thayer's-like primary pattern; relatively small, straight, yet thick/stout bill. Photo is over-exposed; February, 1996, Japan.
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first winter Slaty-backed Gull |
Fig 1) Note the smudge around the eye; Thayer's-like primary pattern; relatively small, straight, yet thick/stout bill. Photo is over-exposed; February, 1996, Japan. |
 Fig 2) Note the pale head, stout bill, heavy build, and pale underwing with thin dark trailing edge to outer primaries (as in Thayer's) plus dark P9-10 from below, forming a dark V along edges of outer underwing. January, 1998, Japan. Photo by Angus Wilson, copyright 1998. |
 Fig 3) Note the pale head and dark smudge around eye; mostly dark tail; primaries and secondaries like Thayer's but with P9-10 solid dark and pale window on inner Ps very large, extending into outer Ss. December 6, 1983, approaching Tokyo Bay from NE. Photo by Jack Bowling, copyright 1983. |
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Fig 4) Note the concentration of dark around the eye; the thick bill w/ little gonydeal angle; and the extensive pale in the primary tips. December, 1999, Japan. Photo by Wataru Kojima, copyright 2000. |