Great Gray owls (Strix nebulosa) require timbered forest and open meadows for habitat. The harvest of timber from the Great Grey Owl's habitat is, perhaps, the greatest threat to this species. Intensified timber management typically reduces live and dead large-diameter trees used for nesting, leaning trees used by juveniles for roosting before they can fly, and dense canopy closures in stands used by juveniles for cover and protection. Rainy Lake, Yellowstone.
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, Great Grey