Northern Harrier juvenile - it took me quite awhile to sneak up where I could get close-up shots of this juvenile. They have a facial disk similar to an owl, which is partially visible from this angle. I believe it helps them hear rodents and other small prey as they fly near the ground. Taken near Olympia, Wa.
Update: Ha, ha, probably louder than that :) I was making a lot a noise stepping on branches and leaves so I was surprised I got this close. Even with sneaking up behind them through the bushes I don't think a mature adult would have stayed put that long. Here's a link on Norther Harriers if anyone is curious : http://www.tetonraptorcenter.org/northern_harrier_species_profile.html