the lands of the prehistoric Planet were ruled by the dinosaurs but the Seas were dominated by a very different group of reptiles the mosasaurs and this is the skull of one of them let's talk about the sea whether it's the smaller bodies of water or the vast oceans that cover the planet they are an integral part of our world and everything that lives upon it not the least of which is due to the various creatures that live both below it and within it and if you think about it the oceans of the world would not be as fun and interesting if there were not creatures within its depths if you look at a shark from say 350 million years ago you'd have no trouble identifying that as a shark and might have some differences with what we think of as sort of the conventional look of sharks today you would not be confused you would know right away that you were looking at a shark that's what shocks many people in this world is that there aren't only creatures in the ocean there are huge creatures in fact some of the biggest creatures that ever exist Ed have been found in the depths of the Waters of the earth so with all of that in mind here now are the 20 largest sea creatures that ever existed
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