Barrow's Goldeneye Bucephala islandica

I've only seen this species in Canada so far.

Barrow's Goldeneye, Emerald Lake (British Columbia, Canada), 17th September 2006

Barrow's Goldeneyes, Golden (British Columbia, Canada), 16th September 2006

If I remember rightly, I identified the above birds at the time as Barrow's Goldeneyes based on the rather steep forehead and relatively short triangular bills. It has to be said that I have no other experience of Barrow's Goldeneye, and even Common Goldeneye with which I am familiar in winter, I have never seen in September. I recall being a little doubtful at the time as there seemed to be some variation in both head shape and bill shape among the birds seen, and evidently this confusion continued when I got home and reviewed my photos. I realised that the following photo appears to show a longer-billed individual and it seems that at some point I re-labelled it as [Commmon] Goldeneye. Looking back at it now I am not entirely convinced. Although perhaps not as steep on the forehead as the ones above, the crown seems rather flat. Was it a Common Goldeneye among a group of Barrow's Goldeneyes, or were they all Barrow's? I'd be happy to hear from you if you're more experienced with these than I am!

Goldeneye sp., Golden (British Columbia, Canada), 16th September 2006