Sirenian - the name of an %F,10,..\h\order%order of 
%F,10,..\h\mammal%mammals. Sirenians--manatees and 
dugongs--have a flattened tail and 
no hind limbs and spend their entire 
lives in water. But they breathe 
with nostrils, not %F,10,..\g\blowhole%blowholes.

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