What happens when no one's watching the animals at the zoo? In this book for readers and listeners up to 7 by the author of Oliver's First Christmas, the penguins are taking props from a stage show, and putting on a dance show, whirling and twirling, hip-hopping and boogie-bopping. When young Julia discovers the penguins' secret, she tries to join them in their fun, but they aren't divulging anything just yet. After Julia waltzes around the floor with a hippo, however, the birds let her teach them the cha-cha, and a merry performance begins. Fittingly, Kristi Valiant's mixed media illustrations are filled with expressive gestures and bold colors.