There is not a toddler alive who isn’t fascinated by the zoo and the animals in the zoo, which may be one of the reasons Dear Zoo is so popular. The book is also popular because it allows toddlers to interact with the book, as it is a lift-the-flap book. Toddlers love doing things for themselves, so they will happily be read to if it means they get to lift the flap to show something that has been hiding. Although Dear Zoo is over 30 years old, it is still very popular.Â