Killer whales may use kelp brushes to slough off rough skin

Salish Sea orcas could be the first marine mammals known to manufacture their own tool

Two killer whales are shown rubbing a small piece of brown kelp between their bodies. One whale is to the upper left. The other is to the bottom right. The second whale's nose comes about halfway up the first's body, lining up with its dorsal fin.

Two killer whales in the Salish Sea rub a kelp stalk (brown) between their bodies.

Center for Whale Research, NMFS NOAA Permit 27038

A brush with kelp may help some killer whales clean up nicely.