One hippo, all alone, calls two hippos on the phone.So begins Sandra Boynton's classic counting story, Hippos Go Berserk! Exuberant hippopotamus guests show up in ever-increasing numbers, until an all-night party is inevitable.

Sandra Boynton Sandra Boynton has written twenty-two books for children and adults, including Chocolate, the Consuming Passion, which spent 24 weeks on the New York Times bestseller list. She has also designed more than 8,000 greeting cards, which sell 20 million each year. She has designed bestselling collections of wallpaper, mugs, T-shirts, balloons, plush toys, and stationery items. Sandra Boynton lives in Connecticut.