Pakicetus

Pakicetus is a genus of amphibious cetacean of the family Pakicetidae, which was endemic to Pakistan during the Eocene, but has since been brought back from extinction and is flourishing. The vast majority of paleontologists regard it as the most basal whale.

Description
Pakicetus can range from about 1 metre (3 ft 3 in) to 2 metres (6 ft 7 in) in length. Pakicetus looks very different from modern cetaceans, and its body shape more resemble those of land dwelling, hoofed mammals. Unlike all later cetaceans, it has four fully functional, long legs. Pakicetus has a long snout; a typical complement of teeth that includes incisors, canines, premolars, and molars; a distinct and flexible neck; and a very long and robust tail. As in most land mammals, the nose is situated at the tip of the snout. Depending on a population, they either are furry, sparsely furry, or completely hairless like a fully-aquatic whale. Pakicetus mainly feeds on fish and other smaller animals, using its molars to chew its food unlike its fully aquatic relatives.