2/21/2012 3:44:04 PM
Videos from the North Slope
Dr. Glen Liston of the snow den study team explains the layers of snow that accumulate in a polar bear den over the course of the season. The team worked in subzero temperatures in northern Alaska to learn more about the type of snow preferred by denning bears.
What do scientists learn by studying polar bear dens after polar bear families emerge in spring? Biologist Craig Perham of the U.S. Fish & Wildlife Service explains.