8. Biggest Killers

Utahraptor, Allosaurus, Majungatholus, Albertosaurus and Tyrannosaurus were the elite killers of the prehistoric world. Scientists now know more about these predatory dinosaurs by studying their skeletal designs and using information revealed through CAT scanning technology. Listen as the expert's size up these predators found in numerous worldwide locations and various time periods in their search of the largest killer of all.