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Southern Ocean

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Orca, also known as killer whales, are the largest members of the dolphin family, found in all the world's oceans. This photo shows an orca hunting a Weddell seal in the Southern Ocean. Photo courtesy of the National Science Foundation Office of Polar Programs / Robert Pitman.
Orca (killer whale) sexes may be distinguished by their dorsal fins: male fins are straight, and female fins curve. Photo courtesy of NOAA.
An orca mother-calf pair in the Ross Sea in the Southern Ocean. Photo courtesy of the National Science Foundation Office of Polar Programs / Robert Pitman.
Hourglass dolphins live in the southern circumpolar waters, from close to the Antarctic ice pack to about 45 degrees south, and they frequently ride bow-waves from ships. Photo courtesy of NOAA / Elizabeth Crapo.
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