Iridescent blue and white Tree Swallow perches on branch in blue sky

bird animal tree swallow swallow tree branch sky blue sky isolated iridescent blue perched nature ornithology birdwatching twig wildlife wild copy space natural feather plumage wing outdoor fauna small background avian one alone lone tachycineta bicolor tachycineta bicolor passerine songbird iridoprocne blue and white beak perch limb tiny portrait ecology