Why certain areas of Yellowstone National Park will soon be closed off
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Some park areas will close for a grizzly bear research survey.
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Visitors warned to avoid marked areas for safety.
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Survey monitors bear population, part of the Endangered Species Act.
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Biologists use bait, like road-killed deer, for capture.
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Survey runs from Aug. 28 to Oct. 31.
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Public must obey warning signs around capture sites.
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Bears handled with safety and care protocols.
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Yellowstone has 1,000+ grizzly bears, males weigh up to 700 lbs, listed as threatened species.
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