close up of chestnut backed chickadee poecile rufescens perched on a birch tree branch; blurred background, san francisco bay

america american animal area atricapillus avian backed bay bird birdwatching black branch california capped chestnut chestnutbacked chickadee clara close closeup copy county cute detail feather francisco free head native nature ornithology outdoors park perched plumage poecile portrait profile rufescens san santa small song songbird space states tiny tree twig united usa watching white wild wildlife