a indigo bunting warbler sings on top of a thorny branch

indigo bunting isolated blue canary bluebird skyline bird birdsong birdwatching animal avian background barb beak bill black branch brown bur call chirp fauna forest needle people one ornithology passerina cyanea passerine perch perched profile sharp sing singing single sit solitary songbird spike stick thorn thorny trill tweet twig warble white woodland illinois midewin national tallgrass prairie united states county