For many years, Colorado's bluebird population was on the decline. But that's changing, thanks to the efforts of people like Kevin Corwin. Heâ€™s a volunteer with the Colorado Bluebird Project, a program of the Audubon Society of Greater Denver. Heâ€™s working with the state to find volunteers who can put up man-made nests and then monitor the birdsâ€™ success. He talks to Ryan Warner.