5 years & up. Build a toy penguin and discover how to balance it! Discover the secret of keeping the penguin stable and upright with the Koontz™ Teetering Penguin kit! Did you know that the penguin's amusing and characteristic gait actually conserves energy. By shifting its weight from side to side and front to back, the penguin moves its center of mass using gravity to expend less energy when it walks. Made from durable, lightweight, recyclable cardboard. Includes simple step-by-step instructions and a fun activity booklet. 8 pieces.