Class Collections Surprise Growing Dinosaur And Unicorn Hatch Egg Kids Novelty Toy - 4 Piece Set4 PIECE SET: Includes 2 dinosaurs and 2 unicorns; Simply add water to hatch your own new friend. JUST SUBMERGE IN WATER: All your little one has to do is submerge the egg entirely in room temperature water. Within 12 24 hours the egg shell will break and the unicorn will begin to hatch. If the water level is low, add water making sure the egg is completely submerged. TEACH YOUR CHILD PATIENCE AND RESPONSIBILITY: Each surprise egg typically takes about