Last one from the Boise World Center for Birds of Prey. The other name for this guy, apparently, is a "Gyrfalcon." Another endangered species, with a usual winter range in the arctic circle.
I can't think of a snappy name for his expression, but he was really interesting to see.
10/1/2020: Finished year 7 (!), with continuing gratitude towards this amazing community. Based in St. Louis, MO. Regular worker-bee and self-taught photography dilettante....