close up of ruby-crowned kinglet regulus calendula perched on a branch; blurred background, san francisco bay area, california

america american animal area avian backed bay bird birdwatching black branch calendula california close closeup color colored copy cute detail fauna feather francisco free head kinglet native nature olive ornithology outdoors perched plumage portrait profile regulus rubycrowned san small song songbird space states tiny tree twig united usa watching white wild wildlife wood yellow