The function point-of-view fails to account for the presence of a femur in addition to processes from the pelvic bone. Altogether, these hind legs in this whale present for contemplation a most interesting instance of those significant parts in an animal -- rudimentary structures." [Struthers, p. 142-143]

The dolphins breathe through their nose, but whales' nostrils drifted back farther and farther onto the top of the head in the fossils found. Today it is just a double or single blowhole, and the ears are closed and internal, detecting only vibrations from the lower jaw. They "speak" through a "melon organ" or pad of fat.

Milinkovitch used results from molecular studies to determine that sperm whales were more closely related to the baleen whales (mysticeti) than to toothed whales (Odontoceti) (Milinkovitch. 1997). But his conclusion was not well accepted, as sperm whales have substantial teeth and a single, rather than double...
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