close up of chestnut backed chickadee poecile rufescens perched on top of a wooden post; blurred background, san francisco bay

america american animal area atricapillus avian backed bay beautiful bird birdwatching black brown california capped chestnut chestnutbacked chickadee close colorful copy cute environment fauna feather francisco free garden green head native natural nature ornithology outdoors perched plumage poecile portrait rufescens san side small song songbird space states tiny united usa view white wild wildlife wooden