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The fastest human can run about 27mph.In the Yellowstone ecosystem, grizzly bears tend to dig or locate dens on the mid to upper one-third of 30°-60° slopes with northern exposures between 6,562-10,006 feet in elevation. Pregnant females den at higher elevations than other females and male bears. Hibernation is varied by as much as one month depending on weather conditions. There are several different types of dens utilized by bears, Grizzly bears tend to excavate dens at the base of large trees often on densely vegetated north-facing slopes. This is advantageous in the Yellowstone ecosystem due to prevailing SW winds which accumulate snow on northerly slopes and insulate dens from temperatures which often drop as low as -40°F to -60°F.Grizzly bears in YNP usually dig new dens but on occasion, dens (especially natural cavities) are re-utilized.
July 7th, 2013
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