In the book, Gerald McGrew is a kid who, when visiting a zoo, finds that the exotic animals are “not good enough”. He says that if he ran the zoo, he would let all of the current animals free and find new, more bizarre and exotic ones. Throughout the book he lists these creatures, starting with a lion with ten feet and escalating to more imaginative (and imaginary) creatures, such as the Fizza-ma-Wizza-ma-Dill, “the world’s biggest bird from the island of Gwark, who eats only pine trees, and spits out the bark.” The illustrations also grow wilder as McGrew imagines going to increasingly remote and exotic habitats and capturing each fanciful creature, and brings them all back to a zoo now filled with his wild new animals. He also imagines the praise he receives from others, who are amazed at his “new Zoo, McGrew Zoo”.