Hilarious hippos make a party out of counting in this Sandra Boynton board book classic first published more than forty-five years ago. Exuberant hippopotamus guests show up in ever-increasing numbers, until an all-night party is inevitable. Hippos Go Berserk! is the first book ever published by children's book master Sandra Boynton, and is perfect for travel time, bedtime, or PARTY TIME! One hippo, all alone, calls two hippos on the phone. Three hippos at the door bring along another four.