In some systems of classification, any of an order (Cetacea) of nearly hairless, fishlike water mammals lacking external hind limbs but having paddlelike forelimbs, including whales, porpoises, and dolphins.
It is the commonest cetacean in the seas round the British Isles, and not infrequently ascends the Thames, having been seen as high as Richmond; it has also been observed in the Seine at Neuilly, near Paris.
Andrews has, moreover, not only brought forward additional evidence in favour of this most remarkable line of descent, but is confident - which Professor Fraas was not - that Zeuglodon itself is an ancestral cetacean, and consequently that whales are the highly modified descendants of creodonts.
He believes that the cetacean approaches not only rocks, but ships, in the hope of freeing itself from its lodgers.
To read about the stranded cetacean, Dan Jarvis from BDMLR has very kindly produced this click here report for you to read.
Compared with many terrestrial mammals, little is known of cetacean natural history.