Who ate my apple pie?

On a sunny afternoon, the little mouse and the little hedgehog made a delicious apple pie and happily prepared an outdoor meal. However, in a blink of an eye, the apple pie was gone, and the only clue was a green tail on the edge of the bush.

"Is this your tail?" The two little detectives talked about suspicious animals all the way. What are the tails of these animals? With this broken tail, can the little detectives find the guy who stole the apple pie?