Killer whales 'massage' each other using kelp

Killer whales in the North Pacific have been observed using kelp to "massage" each other, with researchers capturing this behavior on drones. This unique behavior, where orcas rub kelp between their bodies, is believed to serve a health or hygiene function and also promotes social bonding among the whales. Published in Current Biology, the study highlights the significance of this tool use in killer whales, showcasing their intelligence and social dynamics through this "allokelping" behavior. The research sheds light on the importance of physical touch in animals for building and maintaining social relationships, particularly among highly social species like killer whales.