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 as 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. Fine Motor Skills: Grasping and stacking the animals helps strengthen your baby's dexterity and hand-eye coordination. Thinking Skills: Little ones can practice their problem-solving skills as they figure out how to stack and balance the animals on the bird's wings. Sensory: A variety of bright colors, textures, and fun rattle sounds engage your baby's visual, tactile, and auditory senses.