Hardest shot I ever took

Challenge #61 in the Eclectic series. Hosted by Ro13.
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Ever had one of those shots that just took forever to get it right? No editing...just the perfected shot, and maybe a description of what made it hard.
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Yellowstone Wolf and Bear
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Followed a pack of wolves for over an hour with only a sweatshirt (no gloves) on at 26 degrees F when a bear appeared for a couple of seconds.
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Submitted: Friday, 18th March, 2011 22:53 (GMT)
Taken: Thursday, 16th September, 2010
Focal length: 340 mm
Shutter speed: 1/160 sec
Aperture: F6.3
ISO: 400
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