Thames & Kosmos My Robotic Pet - Tumbling HedgehogBuild your own adorable robotic pet hedgehog! With the 172 building pieces in this kit, you can assemble a real robot that looks like a cute hedgehog. The robot has a built in sound sensor and is programmed to react to different sounds. After you build it, you can play with it by making different sounds and watching it tumble, roll, spin around, bristle its spines, and scurry around. Clap once, and the hedgehog will roll into a ball and tumble