Learn anatomy and enjoy dinosaur fun at the same time! This large T. rex has one removable side that allows you to see how the inner anatomy of the dinosaur functions. By using the DNA key, you can move the leg to see the muscle flex, see the heart and lungs pump, and activate the beast to open its large mouth and roar. Then, double the fun by placing the dinosaur half back on the T.rex and playing out action-adventure scenes from the movie! The Jurassic World: Fallen Kingdom STEM Anatomy Kit Includes a T. rex figure with a removable side. Item measures about 20-inches tall x 10-inches long.