For the second title in this series, I tried it out on audiobook and I liked it even better in that format.  The audiobook is full cast, so each character has a different voice.  Plus it incorporates sound effects and background music.  It is also very well done. I find the GPK books a bit repetitive, but for the age group in which they are written, they should be.  The audiobook takes away the tedium of repetitiveness.  In this book the kids get a Hippo that escaped from the zoo, enter the best pet contest, and try to go to an amusement park.  This book is full of thrills and laughs that young chapter readers are seeking.