The pair of boreal owls that have taken up residence in a nest box we installed in our yard, who we've named Owl-berta and Owl-fred, naturally make use of tree cavities excavated by woodpeckers; such as those seen in this cottonwood. These particular holes were most likely carved out by a Northern Flicker.
Canon EOS 60D, Canon EF 17-40mm f/4L USM, ISO-400 f/10 @ 1/250 sec.
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