The whale article is good, although out of date. More recent discoveries (esp. DNA) have determined it likely whales are not descended from mesonychids, but rather artiodactyls ("even-toed ungulates") themselves, and in fact should be described as being part of that order. They're actually a sister group to the hippos.
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Date: 2007-02-16 07:03 pm (UTC)http://en.wikipedia.org/wiki/Evolution_of_cetaceans