Discover Series Books for Babies & Toddlers Rubber Ducky--you make bath time so much fun! Just make sure to keep this digital board book outside the bathroom to enjoy this cute book filled with rubber duck photos. If our child would rather spend the whole day in the tub, this little book is sure to make dry time more fun. Used as a jumpstart for interaction, Discover Series Picture Books are a great way to introduce new images, words and concepts to kids.