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JACKSON, Wyo. — Officials say sage grouse collisions with aircraft at Jackson Hole Airport have roughly doubled in the last 12 months to about 10.

They say the increase came despite recent declines in both the number of planes and the number of grouse at the airport.

Airport officials and researchers tell the Jackson Hole News & Guide that they can't pinpoint the cause. The increase in collisions started in fall 2009.

The Jackson airport is located in Grand Teton National Park. The airport is undergoing a safety audit, the results of which are expected in early 2011.

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