Because the latter being divided into three branches by the diversity of the habits which, with the lapse of time, they have adopted, some have caused the formation of the Cetacea, others that of the ungulated mammals, and still others that of the unguiculate mammals.    From Wordnik.com.  [Lamarck, the Founder of Evolution His Life and Work] Reference

These analogies, in point of fact, may be traced through the whole of the principal groups in this order, the most important, and the most numerous of ungulated animals. ".    From Wordnik.com.  [Delineations of the Ox Tribe The Natural History of Bulls, Bisons, and Buffaloes. Exhibiting all the Known Species and the More Remarkable Varieties of the Genus Bos.] Reference