(Im)possible Gull-billed Tern at upper end of American Falls reservoir ...
eBird Checklist - 30 Jun 2020 - 83262, Pingree US-ID 43.03056, -112.64353 - 35 species (+1 other taxa)
A torturous one here... I’m helping the Intermountain Bird Observatory YB Cuckoo survey crew and last night ~815pm we were on McTucker Island when I saw a medium-sized tern with a thick black bill flew by heading downriver towards the reservoir. More description in this eBird list - I have it under “tern sp.” as I’m struggling to believe it myself but I can’t make it into any other tern species 🤔🤔. Back on McTucker now & just had 3 Forster’s - a very different look & build.
I’ll plan to look above and below the dam tomorrow after surveys and before heading back to Boise & figured I’d post this looooong shot for anyone birding the area to keep their eyes peeled.
Based on plumage, it was most similar to a non-breeding adult in Sibley - only some small dark “ear” patches, not a full black cap.