Spinosaurus and Tyrannosaurus lived on different continents and different eras. So, the fossil record can not give a definitive answer on which species would win in a battle. It is unknown if Spinosaurus was a better fighter than Tyrannosaurus. Jack Horner explained: "We don't know how ferocious any dinosaur really was, all we have are their skeletons. If you scale the ferocious factor on the length of the animal, there was nothing that ever lived on this planet that could match (Spinosaurus). My hypothesis is that T. Rex was actually a scavenger rather than a killer. Spinosaurus was really the predatory animal."

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