The Mattel D-Rex Prehistoric Pet with Bonus Xtractaurs Starter Kit features D-Rex, a ferocious yet loyal interactive dinosaur with an independent personality. D-Rex combines robotics, sensors and reptilian-like skin to create a lifelike appearance and behavior. He'll walk, chomp and roar to let you know what he wants. Pet and feed D-Rex to become his master, then surprise friends and family with his charging attack!