Killer whales (Orcinus orca ater) may be the first marine mammals known to make a tool, a new study shows. In the Salish Sea off the coast of British Columbia and Washington, whales bite off small stalks of kelp with their teeth. The whales then press the piece into a partner and roll the stalk between their bodies, possibly to help remove dead skin.
Video Credit: Center for Whale Research, NMFS NOAA Permit 27038
