Riddler’s Revenge

I’m not talking about the roller coaster either. It has been a few years since the he has done any crimes, but the obsession to make riddles has been overwhelming him. He just can’t sit too long without leaving clues to his crimes. He could have continued with his crime spree years ago, but he found some donuts that he liked, and well, gained a LOT of weight,

I give you, the Riddler.
By the way, What weighs six ounces, sits in a tree, and is very dangerous?