OOOOH! I LOVE seeing things like this!
We are avid birdwatchers (like the kind of folks I used to make fun of as a kid) and we have quite a large variety here every day. We have cardinals, Cedar waxwings, purple finch, goldfinch, three small woodpeckers and a large woodpecker of a different variety, 3 kinds of sparrow, chickadees, tufted titmice (titmouses?) wrens, orioles, red-winged blackbirds, robins, bluebirds, two males and a female hummingbird, and a pair of birds that I can't think of the name of---that is black---but in the sunlight it turns a brilliant blue-green. (and a partridge in a pear tree--giggle)
I can't find my birdbook, but I think that your bird is some kind of hawk. We had a family of quail two years ago that were living under our picnic table! They were quite a sight...we could almost touch the babies when the parents were away from the area. They were adorable!
Annie
edited to add that while I was hunting for my birdbook that I can't find, and typing my reply---others had posted and have said it was a hawk---I didn't want to look stoooopid and repeat it! Hahaha!