Mr. Fox is like a real fox because he is a clever mammal that has large ears and a long, bushy tail. One interesting fact I found about a real fox is that eat small mammals (like mice), eggs, birds, insects, amphibians (like frogs), reptiles (like lizards), fish, grass, berries, nuts, and carrion (carcasses of animals that they find).
http://www.enchantedlearning.com/subjects/mammals/fox/Foxprintout.shtml