Behaviour Matters: Hippo Owns Up - A book about telling the truthThis funny, charming story is the perfect way to introduce young children to what honesty is, and help them understand the importance of owning up to their mistakes. Also included are suggestions for activities and ideas to discuss together, helping children fully understand how their behaviour can impact others. Hippo is having a bad day. It all started when he missed his breakfast. He can't concentrate in class and his tummy won't stop rumbling.