Primary territorial call.
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Great Gray Owl - Strix nebulosa
The Great Gray Owl is the largest of the North American Owls but not the most massive (a lot of his size is fluffy feathers). Distinguished by its grayish brown color, large size, "white mustache" and "black bow tie" (white throat and black chin). It has distinctive white eyebrows and lores. Standing 27" to 33" tall (about the size of a Turkey Vulture or slightly smaller than a Golden Eagle), the iris of the eyes are yellow, the facial disk has concentric rings, and the bill is yellow to olive green. The Great Gray Owl lacks ear tufts and has a relatively large head with proportionately small eyes. This is a nocturnal owl although largely crepuscular that is often seen hunting at dawn and dusk.