The Attachable Activity Caterpillar is inspired by Eric Carle's classic tale The Very Hungry Caterpillar. Multiple features are sure to entertain your child. Antennae contain Crinkle. sound and the dimensional ball contains beads that make a stimulating sound when spun. Press the yellow body segment to hear Twinkle, Twinkle Little Star. Ribbon tags help stimulate tactile exploration, while the ring with sliding beads creates cause and effect play. Teether rings, and an apple with pocket for in-and-out play are just a couple more that interactive features included in the Activity Caterpillar. Adjustable straps allow easy attachment to the crib, carrier or stroller.