Watch these ferocious monsters grow incredibly in size when placed in water. Make sure that the container is big enough to contain your dinosaur or you will be sorry. Once hydrated, we advise you wear ear protection to protect against their ferociously loud roars and whistles. These dinosaurs are really dynamite because they are potty trained. That's right, no Dinosaur Dung on your floor from these guys. They will remain large and in charge for a week or so and then will start shrinking down to their original size. Safe for ages 3 and up.