Scientists from the University of Texas at Austin have determined that it is a giant, soft-shelled egg, most likely laid by a ...

Fish filled in the oceans, food to fuel sharks, which were fast ruling the waters in the absence of the giant mosasaurs and plesiosaurs of the Cretaceous. Squid and other soft-bodied cephalopods ...

Predators likely included some of the fiercest monsters of the seas, such as the sharp-toothed shark Cretoxyrhina and the giant mosasaur Tylosaurus. Like all plesiosaurs, Styxosaurus's limbs were ...