The Developmental Jiggle Caterpillar, a beloved character from Carle's famous The Very Hungry Caterpillar, is twelve inches high, has a pull down body that jiggles and moves as it retracts up to original size. One mother's five-star review of The Developmental Jiggle Caterpillar on Amazon.com heaped praise, "My 6 month old twin boys LOVE this toy. They enjoy the antennae and feet for playing with and chewing on. They like that they can grab the toy firmly by the ring that has the beads. The handle tail is also a big hit and we've seen them teething on the attachment ring, which is a convenient shape for them to also hold on to. We should have bought two, because our boys enjoy this toy so much."