cassin`s sparrow singing from brush on the grasslands

animal aves avian background barbed behavior bird birding birdwatching brush cassinii cassins close closeup color colorad colorado coloradopeucaea conservation detail environment fauna feather fence field from grassland grasslands life living natural nature organism ornithology outdoor outdoors outside passeriformes passerine pawnee perched perching peucaea plains rural singing small sparrow summer vertebrate wild wildlife wing wire