This looks like it's most likely a robin, though it was kind of big for a robin, and the color is a little weird. Maybe it's molting, or some such. Anyway, it was perched right outside the window, and Her Majesty found it absolutely fascinating. So I took a picture.
Bluebird.
Excuse me, Blueboid.
Really?
It wasn't particularly blue. Its back was pretty much the grey-brown color I expect for a robin.
That's a female, which are slate-grey on the back with a more bluish tint to the wings. The males are the ones that are the brilliant blue.
Female I think. Maybe last year's chick just getting it's color. Shouldn't be bigger than a robin though, and that's a pretty strong eye-ring, so I might be wrong. rb
I thought robin at first because the eye ring appears broken in back of the eye, but with the white belly and shortish tail it's most likely a female Eastern Bluebird. Should be smaller than a robin, but it is puffed up in the cold. Hard to tell size without something to compare to.