This Month in Photo of the Day: National Geographic Magazine Features

An Atlantic walrus plods toward shore after gorging on clams in the shallows. Such a big bull may stir up, shell, and suck down thousands of clams a day in summer, relying on his muzzle full of sensitive whiskers, called vibrissae, to help locate prey.

See more photographs from the March 2009 feature story "Svalbard."