Researchers have documented killer whales using seaweed for grooming, a behavior described as a “spa day” for the marine mammals. The observations were made by Rachel John, a master’s student at Exeter University, who noticed Southern Resident killer whales in the Salish Sea breaking off bull kelp with their teeth and rubbing it between themselves. This behavior, named “allokelping,” is believed to aid in skin maintenance, with whales showing more dead skin being more likely to participate. The activity, primarily occurring among family members or whales of similar age, suggests a social aspect. While some experts question the uniqueness of this behavior, researchers warn that the declining population of these killer whales could lead to the loss of their distinct cultural behaviors. (Newser)
