 Although this Eastern Screech Owl is using a natural tree cavity, there is a scarcity of natural cavities and woodpecker excavated cavities for cavity nesting birds, large and small.  You can build nest boxes to attract specific species, or buy an attractive birdhouse from a variety of wild bird stores. This Duncraft Eco-Friendly Wren House, constructed with recycled materials, is being inspected by a Carolina Wren.  Large cavities are in short supply, so birders provide a conservation service by installing big nest boxes. This big nest box has been used successfully for several nesting seasons by Barred Owls in Jim Carpenter
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