When Nelly reads a description of mice in a book, she is convinced that she is a mouse. After all, she is gray, has big ears, and a thin tail. But then she meets some other mice, and her confusion only grows. Why are they smaller than she is? And why can't she do the same things the other mice do? Only a trip to the zoo will set this mixed up animal tale straight ... or will it? This delightfully funny story about mistaken identities is sure to get giggles from young listeners.