Answer to yesterday's bird butt question - Black Capped Chickadee!
Shortly after Mr. Chickadee mooned me from the tree branch above, he landed on my deck post and proceeded to poop. Gosh, couldn't he have done this while he was in the tree?! (You can see his handiwork on the left side of the photo.)
Robin (Erithacus rubecula).
24 minutes ago