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Scientists observed the surprising social behaviour, dubbed allokelping, in drone footage of killer whales
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Orcas, also known as killer whales, have been documented using an ingenious method to groom one another, a new study reveals, by detaching sections of seaweed to provide a communal back scratch.
Researchers observed the marine mammals biting off the end of a kelp stalk, positioning it between themselves and a companion, and then rolling the seaweed between their bodies for extended periods.
