Whales are often seen to represent creativity and intuition in many Native American cultures. They can also symbolize death and rebirth, a regenerative cycle. They are viewed as being gentle, highly intelligent, and socially advanced. All cetaceans, including whales, dolphins and porpoises, are descendants of land-living mammals of the Artiodactyl order (even-toed ungulate animals). Both cetaceans and artiodactyl are now classified under the super-order Cetartiodactyla which includes both whales and hippopotamuses. In fact, whales are the closest living relatives of hippopotamuses; they evolved from a common ancestor at around 54 million years ago. Whales entered the water roughly 50 million years ago.