All you need to do to cultivate a dinosaur is fill the jar with water, making sure the egg is completely covered, and sit back and relax. Within just 24 hours you will see your prehistoric marvel growing and starting to hatch through the egg! Make sure the egg stays covered in water, top it up if you need to, but keep watching. Once dino is completely free, remove the egg shells, but continue to keep an eye on him as he expands over coming days. Once he stops growing he’s ready for a name and to be introduced to friends and family. Jar height – 9cm. Age guide: 5-12.