Several office parks in the Hillsboro area have nice open spaces that attract birds. AmberGlen has a pond next to a large lawn which attracts good numbers of gulls in winter.
Most of the gulls on my recent visit were Ring-billed Gulls, but two Mew Gulls were in the mix. Here is a nice comparison of the two species.
Ring-billed Gull enjoying a roust
and a swim
This Glaucous-winged Gull was rocking the lipstick.
Ring-necked Ducks
Here is a male Eurasian Wigeon, with an American Wigeon in the background. I am guessing this is a young bird molting into his first adult plumage. It seems a little late in the season to me, but I don’t know whether this Asian species has a different molt schedule from his North American counterpart.
Ethical Birder 