With the Fisher-Price® Stack and Rattle Birdie, your baby can stack the four animal friends on the birdie's wings to balance the weight, or stack 'em all up on one side and watch the birdie wobble and rock. Each of the animal stackers has a friendly face, fun textures, and bright colors to excite and delight your baby's senses. For added fun, the birdie has a spinner on its belly, ribbon hair, and colorful beads in its wibbly-wobbly base that rattle and roll as it rocks back and forth! Where development comes into play™