Dinosaur Hatch 'Ems Egg As Shown. Placed in water, the 2 3/8" egg gradually cracks open over a period of 48 hours. The endearing and durable dinosaur is revealed, and grows to approximately 3". Will eventually shrink if removed from water. To re-"grow" at to a bigger penguin, just put it back in water. For Ages 3 & Up.