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Cavity Nests

Some woodpeckers, trogons, and nuthatches can excavate their own nesting holes. Other birds like chickadees, bluebirds, some owls, ducks and flycatchers use holes abandoned by their "previous owners." 
     

Williamson's Sapsuckers usually nest in a hole in the trunk of a partly decayed pine or aspen tree.  The nest hole can be as low as 5 feet or as high as 60 feet above the ground.

The male and female both incubate the 3 to 7 (usually 5 or 6) eggs, for 12 to 14 days.  The young will leave the nest 29 to 35 days after hatching.

Mountain Bluebirds nest in cavities which they line with weeds, rootlets, grasses and other organic fibers.  Usually they lay 4 to 6 eggs which are incubated for about 14 days.

The young bluebirds will leave the nest about 21 days after hatching.