Scientists have observed killer whales using kelp as a tool to massage each other in the waters off the coast of North America. The behaviour, captured by drones, shows two orcas rubbing their bodies together with a piece of kelp between them.
Researchers from the University of British Columbia recorded 30 instances of kelp rubbing over 12 days of observation. The orcas, part of a group known as the Southern Resident Killer Whales, appear to use the seaweed for social bonding or skin care.
The scientists are unsure if this behaviour is unique to this population, but they believe it could have multiple benefits for the animals. The study provides new insight into the lives of these threatened creatures.
Researchers hope the findings will highlight the importance of protecting coastal waters where the orcas live, hunt and massage one another. The Southern Resident Killer Whales are listed as endangered, with only about 75 individuals remaining.
