male western bluebird perched on oak branch in morning sunlight

america animal animals avian bird bird tree watching birding birds birdwatching blue blue bluebird branch colorful daylight ecology ecosystem environment fauna forest gambel oak habitat male natural natural lighting nature people oak ornithology outdoor passeriformes passerine perching quercus gambelii sialia mexicana small songbird songbirds summer thrush united states utah western western wild wildlife zoology