Hey Rafael,
I think I can take this one!
Both are present, 1 male of both species, that is. Plus two female Common. If you were looking at a Common and trying to make it into a Barrow's that might explain the difficulty. Look for the Barrow's and you'll be golden. Aye? (sorry)
The easiest field mark to differentiate is the white spot in the lores/cheek: Barrow's is crescent-shaped and tapers to a blunt point above and in front of the eye and Common is circular, roughly. The scapulars are uniquely patterned. Barrow's has that nifty series of rectangular white spots on black, part of the folded wing.
I just came from there and can vouch that both are continuing, as of nightfall tonight. All below the falls in the widest part of the river. Two Common Mergansers are new arrivals, male and female. Above the spillway are three Hooded Mergansers. I assume that's one addition to the two found last month, but they could be three new arrivals.
Richard
On Mon, Jan 7, 2019 at 2:42 PM Rafael Adams <soposup@gmail.com> wrote:
Saw the 3 Ring-necked Ducks and the Goldeneye this morning. Can anyone explain why this has been deemed a Barrow's Goldeneye rather than a Common Goldeneye? I certainly couldn't make that determination on my own.
The Eurasion Wigeon and Pintail continue in Kennebunk on Old Port rd. Good looks.
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