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Prehistoric Monsters of the Deep: Slideshow

By History.com Staff
The giant marine reptiles known as mosasaurs quickly evolved from small, land-dwelling lizards into the aquatic equivalent of Tyranossaurus rex, reaching the top of the marine food chain through swim-friendly anatomical changes, according to new research. Find out more about these fearsome sea creatures of the Cretaceous as well as other supersized beasts that dominated the depths millions of years ago, from sharks bigger than a bus to sea scorpions that would dwarf humans.

Categories: Animals, Marine Life