Cetaceans belong to the order Cetartiodactyla (formed by combining Cetacea Artiodactyla) and their closest living relatives are hippopotamuses and other hoofed mammals (camels, pigs, and ruminants), having diverged about 50 million years ago.Cetaceans range in size from the 1 m (3 ft 3 in) and 50 kg (110 lb) Maui's dolphin to the 29.9 m (98 ft) and 190,000 kg (420,000 lb) blue whale, which is also the largest animal ever known to have existed. They have streamlined bodies and two (external) limbs that are modified into flippers.It is believed that Panchjanya, the conch shell used in the Mahabharata was discovered here in the "Shankh Kund". It is said that Vishnu covered the demon Madhu under the hill after defeating him to death.
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This video outlines the discovery and excavation of the Terra-cotta Army in Xian China.
The extinct ancestors of modern whales are the Archaeoceti.
While cetaceans were historically thought to have descended from mesonychids, molecular evidence supports them as a relative of Artiodactyls (even-toed ungulates).
The hindlimbs of cetaceans are internal, and are thought to be vestigial.