Seals, sea lions and walruses (Pinnipedia) use their whiskers (vibrissae) to explore their environment and locate their prey. Today they live mostly in marine habitats and are adapted for a highly specialized amphibious lifestyle with their flippers for locomotion and a hydrodynamically streamlined body. The earliest seals, however, lived on land and in freshwater habitats, much like otters and their relatives (mustelids) today. Life reconstruction...