New evidence has paleontologists questioning whether a third of all dinosaur species ever existed. Could some discoveries once thought to be distinct species, in fact, be the same species at different stages of development?
National Geographic joins famed paleontologistsincluding Jack Horner, a contributing expert to the Jurassic Park filmswho are challenging the long held belief that young dinosaurs looked like miniature versions of their parents.
Bonus Program: Prehistoric Predators: Monster Shark
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