Smithsonian Prehistoric Sea Monsters Hatch and Grow Complete Triop Kit Environmental Science INTERACTIVE: Hatch and grow your own prehistoric pets! COMPLETE KIT: Includes everything you will need to grow your sea monsters LIFE SIZE: They hatch and grow to more than 20X their original size! INCLUDES: 23" X 17" full color poster EDUCATIONAL: Witness a 220-Million year old species come to life!