Mountain Bluebirds might simply be known as "Blue Streaks," because the striking blue flash of these birds in flight might take you by surprise. As you can imagine, they're quite easy to spot because of their color; you're likely to see them on fence wires and the tops of tall grasses. These little birds love Montana's wide-open spaces. Among bluebirds, they are the only ones who are totally blue; their cousins, the eastern and western bluebirds, have sky blue backs and reddish breasts. Mountain bluebirds eat mainly insects and rely heavily on man-made nesting boxes for nesting space. Bluebird nesting boxes are usually placed on fence posts in open meadows, so wherever you see the boxes, keep an eye out for bluebirds.