New 3-D maps unveil walruses' icy world
Wednesday, December 19, 2012 - 14:00
in Earth & Climate
Walruses are sort of the Goldilocks of the North Pole — the chunks of sea ice they call home must be just right. If the ice floe is too large, the walrus can't get to water quickly enough to escape a polar bear attack; too small, and the ice can't support their weight and the walruses go splashing into the sea.