"You two are just alike!" everyone tells duckling twins Olivia and Lily. But while Olivia likes to "jump in the mud," run around, and quack so everyone can hear, Lily prefers studying and daydreaming. These different activities don't always work well together, and eventually the twins grow annoyed by their differences and head off in opposite directions. But the twins can't stand to be apart for long. Lily comes looking for Olivia only to find her stuck in a tree. An adventure ensues than ends in a frightening tumble. Finally safe, the twins realize that while sometimes they are the same and sometimes they are different, one thing is certain: they are "'always twins.'"