On yesterday's ride in the foothills of Pole Creek Mountain, our first clue was the wood chips on the ground beneath a dead aspen snag. Had someone been using a chain saw out here, at least a mile off any beaten path?
A head poked out
*The cavity nest is built by both male and female and takes 1-2 weeks to build. The male does most of the excavating, but the female prefers to do the detailing work herself. (Gee, that sounds a lot like how projects go at our house!) They prefer to build their own nest, but will sometimes refurbish and re-use an abandoned nest.