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Orcas in the Puget Sound have been observed engaging in a curious behavior: aggressively swimming onto shoal beaches to, apparently, rub themselves on the pebbles that form the beaches. The behavior seems to be limited to the whales in the region and researchers are a bit taxed to explain the practice. The orcas are, after all, exposing themselves to the threat of beaching, while there is no known benefit gained from the activity. Social rewards and thrillseeking have been proposed, but the jury’s still out. The Smithsonian elaborates:¬†http://www.smithsonianmag.com/smart-news/what-makes-some-orca-whales-love-good-belly-rub-180954219/