Note the multiple woodpecker holes. dead trees harbor wood borers and other insects inside that offer critical food sources for winter birds ( like woodpeckers,nuthatches,creepers, especially titmice and chickadees among others)
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"It is the life of the crystal, the architect of the flake, the fire of the frost, the soul of the sunbeam. This crisp winter air is full of it."
--John Burroughs, conservationist and author