Book excerpt: Some days, it's easy to feel friendly or funny or silly. But other days, it's easier to feel mad or mean or snappy-in other words, to be a crab. In this accessible introduction to moods and feelings, children will meet an underwater world full of friendly creatures, including a little crab whose changing moods show that it's okay to have days when you're feeling a little bit under the weather. Things will turn around soon enough!