a pair of tree swallows tachycineta bicolor sits on a nest box in stroud preserve, chester county, pennsylvania, usa

america american animal avian background beautiful bicolor bill bird birding birds birdwatching blue bokeh box bright chester colorful county cute fauna feather feathers field head lands meadow natural nature nest ornithology outdoors pennsylvania perched perching portrait preserve pretty small states stroud swallow swallows tachycineta tree united usa watching white wild wildlife