What are cetaceans?



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    Cetaceans are some of the mammals in the oceans:  whales and dolphins.  Because they live in marine environments, their fossil record is well established and articulated, and the evolution of cetaceans is well-documented.  Including the largest animal that has existed:  the blue whale; as well as the smartest:  the dolphin, the study of cetaceans is fascinating.  They are also the subject of conservation issues, as some species have become endangered. 

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