After posting the photo of the headless carcass with dusky reddish legs, it appears we now have a consensus on Bird B. The underwing of the headless carcass bears the classic pattern of an American Black Duck–white overall, with several distinct dark brown feathers at the wrist joint. With that in mind, looking back at the foot of Bird B, it looks like it too is very likely an American Black Duck. And in fact, when I posted the original DBQ, I was able only to access that single foot photo. Now that the database is fully up and running again, I found this photo as well:
And the case for Bird C was sealed by that additional photo–this bird was a Red-breasted Merganser.
I am in the last, thrashing weeks of the semester, readers, so please bear with me on the paucity of blog posts and the slowness of my email responses! Two weeks left until classes end and I turn my attention elsewhere. SEANET being a province of elsewhere, in case you wondered.