Observers onboard the R/V Norseman II
Amanda Herbert (foreground) and Ami Everett onboard the R/V Norseman II. Amanda and Ami are on top of the wheelhouse of the ship to observe groups of Pacific walrus hauled-out on sea ice. Observers assign each animal in a group to an age/sex category according to published criteria.
Photo taken by William Beatty, U.S. Geological Survey