Unearth an authentic Mosasaurus skeleton, just like real paleontologists do. Kids can use the included hammer and chisel to uncover the "fossil pieces" buried in a gypsum brick. Follow the simple instructions to assemble and display this prehistoric swimming "lizard. " The Mosasaurus grew to be 18 meters long and resembled a crocodile with large flippers. Mosasaurus fossils have been found in Western Europe and North America. Every Geoworld toy is designed to inspire young scientists. For 30 years, Geoworld and its founder, paleontologist Stefano Piccini, have shared their knowledge and passion for the natural world.