Thayer's Gull (center) - adult found late (17:35hrs), unfortunately after all the local birders had left having seen the Slaty-backed Gull. The bird was bathing when I first noticed the rather white looking underwings, otherwise I might have passed over it as an American Herring Gull. However, clearly a smaller bird with a more petite shape, shorter reddish legs and medium-dark eye. In this light, the upperpart tone was virtually identical to American Herring Gull. NB. More notes to be added to these shots soon.
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