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12 hours ago, gstacks said:

Non-breeding adult.

Although the image is over-exposed, one can still see the buffy-brown on the back and the tertials and other wing feathers and the relatively extensive dark tips to the primaries. This is an immature in its first calendar year of life. Adult Forster's Terns are nearing the end of their prebasic molt and are nearly pristine, as here: https://macaulaylibrary.org/asset/266315481#_ga=2.181571621.30951479.1599863273-1184313056.1549327880

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