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Transient orca, also know as Biggs killer whales, swim back and forth next to several harbor seals, seen in the San Juan Islands, Washington, USA. The orca were actively hunting the harbor seals, one of their most common prey species. Suddenly the orca darted away from the small island, and researches believed they had caught a seal, although it was not visible from the surface. Killer whales are actually the largest members of the dolphin family, and are regularly seen in the Salish Sea of Washington and British Columbia. Transient orca feed exclusively on marine mammals, including seals, sea lions, and even dolphins and baleen whales. September 2, 2013. Photo © William Drumm.