the museum of natural history has a new exhibit, umag blizzard -- umag a lizard -- a mega lizard even larger than the to run a source wrecks. reporter: teeth make short work of predators. spinosaurus was a special kind of dinosaur. >> it is a bit like working on an extraterrestrial. distinguish this dinosaur from others. reporter: adapted in so many ways to life in the water, is one-of-a-kind. we usually know dinosaurs as land animals. it is a land animal the spinosaurus will be rooming with. the to run a source rick's -- the two restless wrecks has been the star of the show until now. things may get tight. spinosaurus is three meters longer. in real life, they would not likely have crossed paths separated by 40 million years. with the t. rex coming from north america and the spinosaurus from today's north africa. >> what we now know as a barren, vast desert scape was at one time--and fertile and probably -- lush and fertile and probably the most dangerous place on earth. reporter: for dinosaur fans, berlin may be the most exciting place on earth. visitors have four months to enjoy th