A brush with kelp may help some killer whales clean up nicely.
A group of killer whales (Orcinus orca ater) residing in the Salish Sea off the coast of British Columbia and Washington tear short stalks of bull kelp (Nereocystis luetkeana) with their teeth and use the pieces to groom one another, researchers report June 23 in Current Biology. The behavior may represent the first toolmaking observed in a marine mammal and the first among wildlife that benefits two individuals at the same time.
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