I have actually had this post in the draft box for a few days so it seemed like a great time to get it finished and posted. I was not intending it to be a quiz post, because I think this one is much easier than the Codge's.
This was a carcass we found in the Mono Basin earlier this Fall. Habitat was on the edge of a wetland. The likely predator should be about as easy as the prey.
I will say this. Birding is much easier when you get one of the little bastards in hand. Maybe that is why I like herping so much. You can get them in hand and take the time to key them out. My brain might not process fast enough for birds. No wonder the early guys orinthologists birded with shotguns.