Editing Cetacea (section)

==== Marine animals ====

Since the late Eocene, about 40 million years ago, cetaceans populated the subtropical oceans and no longer emerged on land. An example is the 18 metre long ''[[Basilosaurus]]'', sometimes called ''Zeuglodon''. The transition from land to water was completed in about 10 million years. The [[Wadi Al-Hitan]] ("Whale Valley") in Egypt contains numerous skeletons of ''Basilosaurus'', as well as other marine vertebrates.<ref>{{cite web |title=First intact fossil of prehistoric whale discovered in Wadi Al-Hitan |url=https://www.iucn.org/content/first-intact-fossil-prehistoric-whale-discovered-wadi-al-hitan |publisher=[[International Union for Conservation of Nature]] |date=9 June 2015}}</ref>

{{anchor|Classification}}