Dinosaur Constructables lets you build a T-Rex, Triceratops, Brontosaurus and Mastadon, all with the ability to actually walk. Hook up several different parts to the power pack, then turn it on and watch your creation actually move. Build and re-build for hours, creating lots of cool prehistoric designs. Includes 18 chunky pieces. Requires 1 "AA" battery (not included). Compatible with other Constructables Building Sets, not included.