Thelist of extinct cetaceans features theextinctgenera andspecies of the orderCetacea. The cetaceans (whales,dolphins andporpoises) are descendants of land-living mammals, theeven-toed ungulates. The earliest cetaceans were still hoofed mammals. These early cetaceans became gradually better adapted for swimming than for walking on land, finallyevolving into fully marine cetaceans.
This list currently includes onlyfossil genera and species. However, theAtlantic population ofgray whales (Eschrichtius robustus) became extinct in the 18th century, and thebaiji (or Chinese river dolphin,Lipotes vexillifer) was declared "functionally extinct" after an expedition in late 2006 failed to find any in theYangtze River.
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