I've just been messing around with the Winter Raptor maps that are on the East Cascades Audubon Society's website at http://www.ecaudubon.org/winter-raptor-survey. I'm not sure everyone knows about this amazing source so I'll plug it here. Jeff Fleischer and Kevin Black-Tansky (working with the folks at National Audubon and Environmental Systems Research Institute) have created interactive maps summarizing the data that Jeff collects and collates on NW winter raptor populations. Just click on one of those raptor silhouettes and click on the icon in the upper left hand corner that looks like a stack of papers (layers). Choose a species and watch what happens. Zoom out to see the whole Pacific NW or zoom into your own patch and check out the raptor populations. Very, very cool. Kudos to Jeff and Kevin.
-- It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. Mark Twain