This tree once stood on the shoreline of Hog Island in Maine, with a sweeping view of Muscongus Bay— not a bad place to raise successive generations of young birds. According to the US Forest Service, some 85 species of birds, including owls, woodpeckers, chickadees, titmice, flycatchers, and swallows, nest in tree cavities. You might catch a glimpse of birds excavating a tree hole, or coming or going from one, but it’s rare, indeed, to see one from the inside. This old woodpecker hole was cut open after the tree fell, revealing the nest cavity inside. The sketch is much reduced from the real thing. The eggs of various birds that use nest cavities are painted actual size.
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