Scientists study a prehistoric watering hole in Utah that became a colossal deathtrap for many dinosaur species who fell prey to predators like the allosaurus and ceratosaurus.
Scientists try to re-create what happened when a pack of deadly deinonychus raptors took on a plant-eating dinosaur known as the tenontosaurus more than double their size.
Undersea battle between the megalodon, a 50-foot cousin of the great white shark, and the ``biting sperm whale'' with 44 teeth equal to those of a tyrannosaurus rex.
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