- Zippo doesn"t want to be an ordinary hippo. He wants to be super! Being good at swimming and splashing in mud aren"t really superpowers, though. Perhaps he can fly like his friend Roxi. But who"s ever heard of a flying hippopotamus? Especially one with such a big bottom... From award-winning author Kes Gray and exciting new illustrating talent Nikki Dyson. This fantastically funny superhero will be flying into children"s imaginations everywhere!