Little Hippo is playing and pretending he is a firefighter.  He has a truck and rushes off to fight a fire.  He first encounters Big Hippo and gets stuck in the mud and needs help getting out.  He then runs into gazelle and gets stuck in the long grass and needs help getting out.  And so it goes, he rushes to help and ends up needing help.    A simple story and simple text, easy for young kids to understand.