Grizzly Bears Face High Mortality Rates

Kachina, a four-year-old female grizzly bear, eats treats as she plays with a pumpkin at the San Francisco Zoo, Wednesday, Oct. 24, 2007. The bear treats are part of the Zoo's annual Halloween "Boo at the Zoo" and Dia De Los Muertos" celebration. (AP Photo/Paul Sakuma)

(AP) -- Grizzly bears in the region in and around Yellowstone National Park have suffered unusually high mortality rates so far this year, likely because of a dearth of natural food sources, a researcher said.

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