Caitlin loves wild animals. She begs her parents to let her have an unusual pet. They turn down her requests for a panda, a camel and a boa constrictor. But they are happy to let her have a mouse. What they are not ready for is the kind of mouse it turns out to be. Hippopotamouse is a hilarious story about an imaginative girl and her extraordinary pets. At a deeper level it is about adults listening to what children have to say.