Piranha

So N has a new word, and it's Piranha! He says "na na na". Why piranha? He got a set of board books called "What's at the Aquarium" for his birthday from his aunt and family in Vancouver. One of the books is called "Dangerous Fish" and the piranha is on the last page. The books are very simple. Cartoon character of a fish on one side and the name on the other. N loves them.