Why certain areas of Yellowstone National Park will soon be closed off

Some park areas will close for a grizzly bear research survey.

Visitors warned to avoid marked areas for safety.

Survey monitors bear population, part of the Endangered Species Act.

Biologists use bait, like road-killed deer, for capture.

Survey runs from Aug. 28 to Oct. 31.

Public must obey warning signs around capture sites.

Bears handled with safety and care protocols.

Yellowstone has 1,000+ grizzly bears, males weigh up to 700 lbs, listed as threatened species.

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