Dark-eyed (Slate-colored) Junco - Junco hyemalis - not exactly tack sharp focus, but if you click on the image for the full-screen view, you will see that it is still moving in the air and has just folded its wings to land on a branch. Also note the white feathers on the edge of the tail, these are usually not obvious when the Junco is perched in a tree or foraging on the ground.