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Article updated: 3/2/2013 4:10 PM

Ban on killing wolves spurs nonlethal options

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The Lamar Canyon wolf pack moves on a hillside in Yellowstone National Park, Wyo.

Associated Press/August 2012/ Wolves of the Rockie

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Wildlife biologist Linda Thurston of Defenders of Wildlife untangling a string of fladry, a non-lethal system for protecting livestock from wolves, on a ranch in the Paradise Valley, Mont. Research shows the flags, often backed up by an electriclaly charged wire, somehow make wolves less likely to cross the line, offering protection for livestock that are bunched up at calving time.

Associated Press/Sept. 13, 2004

Associated Press/Feb. 13, 2010 Wolf coordinator Russ Morgan with a female wolf pup just fitted with a radio collar in northeastern Oregon.

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At the end of 2012, wolf numbers in Oregon had risen to 46 from 29 in 2011, according to state fish and wildlife officials. Meantime, four cows and eight sheep were killed last year by two separate packs, while 13 cows were killed by one pack in 2011.