Probably the most hair raising noise I've heard in the outdoors is two bobcats fighting. In the moonlight deep in the national forest alone walking out with a bow killed deer in the backpack and when that ruckus kicks off about 150 yards ahead of you it will cause you stop for a minute or two to figure it out before continuing on that direction.
Every normal man must be tempted, at times, to spit on his hands, hoist the black flag, and begin slitting throats.
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