Experience Muscle Madness with this intimidating Jurassic World Tyrannosaurus rex! Press the front button and the T. rex chomps and roars along with a dramatic new feature -- her neck, shoulder and upper back muscles grow larger to intimidate foes. A back button activates an additional evolution feature - the tail spikes extend to enhance her defense. This 21.5-inch long dinosaur with this groundbreaking combination of features also has authentic design and texture and articulated joints for posing. This figure is suitable for Jurassic World fans 4 years and older. Scan the Tracking Code on the dinosaur's foot in the free Jurassic World Play App with a compatible smart device (Android or iOS, not included) to unlock a digital version of the dinosaur and play the fiercely fun game that races vehicles on land, air and sea. Colors and decorations may vary.