Helping Otto, The Penguin: A Children's novel for ages 5-7

A book about Otto, the penguin. Meet Otto and his friends, who are trying to rescue him from the zoo and get him back to Antarctica.
Otto is a sad penguin who was taken from the South Pole, far from his parents and put in a zoo. His friends, a duck, a frog and a deer try to help him. Will they be able to save him?
If you like adventures and want to know what happened to Otto, get this book.