Whew! About blew up the blog. But it’s safe from me. For now. :)
The bird last time was a Chestnut-backed Chickadee. Chickadees' claim to fame (besides being cute) is they're fond of feeders and say their name, “Chicka-dee-dee-dee.” (Do you quote birds?). They don’t say the Chestnut-backed part1. (See footnote)
Some bird sources like to say “chickadees are curious about people.” Maybe. But that hasn't been my experience.
More likely, since they flock to feeders, they get used to us. And know where their bread is buttered. I keep trying to tell people birds aren’t really all that dumb.
That having been said, and here is where I think all this got started, an old and respected bird book reported seeing a chickadee peering into windows to see what the humans were doing. I realize some animals are curious but with all due respect to anthropomorphism it is far more likely he was looking at the cute chickadee reflected in the window. (Both sexes look the same so how would he know?) :)
Here's an Interactive range map at ebird.org.
Footnote: 1 Actually it is still unknown whether any Chestnut-backed Chickadees say “Chestnut-backed-chicka-dee-dee-dee.” :)