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http://www.cbc.ca/news/canada/north/bowhead-whales-exfoliate-cumberland-sound-nunavut-1.4416539"We would see whales rolling around… on occasion we would hear really loud vocalizations that sounded almost like a moan," said Sarah Fortune, a PhD student and the study's lead author."We were really perplexed," said Fortune, who initially set out to observe whale feeding patterns. ... But when they saw large pieces of skin peeling away from the whales' bodies, it clicked. The whales were rubbing off dead skin on boulders in the shallow water. They were exfoliating and Cumberland Sound was, in a way, a giant salt-water spa.Later, in 2016, they researchers went back. Aerial drone videos confirmed their hypothesis — that the whales were, in fact, engaging in some rock-rubbing action."They used these rocks almost like a pumice stone," said Fortune.
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