Male Mountain Bluebird (Sialia currucoides) Returns to Nest Box to Feed Juvenile, avian, bird, Bluebird, Bluebird nest box, breeding, breeding plumage, CO, Colorado, female, female perching on nest box, flight, flying, landing on nest box, male, male at nest box, male bluebird at nest box, male Mountain Bluebird at nest box, Mountain Bluebird, Mountain Bluebird (Sialia currucoides), Mountain Bluebird at nest box, nest box, Ridgway CO, Ridgway SP, Ridgway State Park, Sialia currucoides