To those to said Mountain Chickadee, Congrats. You're correct. The first thing to note on this bird is the overall gray appearance. Sparrows are mostly brown. This bird is not. The next thing to note is the buffy gray, unstreaked flank. Because of the overall color appearance, a certain family comes to mind, Paridae. The Chickadees and Titmice. If you note the Junco in the background, it is a typical "Oregon" type Junco. Typical of the western USA. The brown grass also suggests Western USA (even in winter, grass in the Eastern US tends to stay mostly green).
The Black head stripes on this bird confirm it as a Mountain Chickadee.
Pretty unmistakable bird usually, but when you have a look like this one, it can be a little tricky. The above photos give you a little bit different look.
Thanks for guessing! I'll have a new quiz up sometime soon.
Ok, so the last quiz was kind of a joke. This one is serious and a bit tricker.
The only clue you get this time, is the time of year.