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I am an avid birder and citizen scientist. I love helping others identify wildlife and enjoy learning new things. I am also an Eagle Scout.
Anthem, AZSign In to follow
I'm assuming the bird in question is the one at center in the foreground, correct? If so, then I do believe it is an adult nonbreeding Thayer's. The extensive streaking around the neck and head combined with the 'softer' head shape and smallish bill are indicative of this species. I don't think the wing or back is too dark. I believe the overcast conditions in which the photo was taken intensified the color. Since I am not a gull expert, please wait for other comments before making your decision.
When I zoom in, I realize that what looks like a fleshy-pink bill is actually a strip of land in the background. What looks like the rest of the head is actually the back of a goose's long neck and small head - most likely that of a Brant judging by the extensive white underparts. The stocky legs set far apart and the bulky undercarriage are indicative of a goose as well. Additionally, Brown Boobies are typically observed on prominent perches such as rocky outcroppings or man-made structures rather than on the ground or, especially, in shallow water.