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Great Horned Owls are not cavity dwellers. Instead, they typically take control of open nests build by other large birds. They will also nest on contained ledges and other protected but open features of human-made structures.
Barred Owls, somewhat smaller than Great Horned Owls, are indeed cavity dwellers and will be found in trees where a large portion of an interior cross-section has rotted away, as well as in human-made purpose-built nest boxes.
Yes, dead trees are critically important.
JimmyJoeLard 3 years ago