While a close relationship between these and ungulates had already been proposed by Frank Evers Beddard in 1900, and is generally accepted today, cetaceans have diverged so radically from their ancestors' lifestyle as to confound analyses of fossils and perhaps even DNA.
Mentres que unha estreita relación entre estes e os ungulados xa fora proposta por Frank Evers Beddard en 1900 e é xeralmente aceptada hoxe en día, os cetáceos diverxeron radicalmente do estilo de vida dos seus antepasados yanto como para confundir as análises de fósiles e mesmo de ADN.