Postman Pig

The Postman Pig is a Medium Pig found when you click/tap the pause button. He has updates for you in the level you're playing. When you tap or click on him when happy, he feels sad and rain is above him. When you tap or click on him when sad, he feels happy. When he is sad, the updates disappear. When he is happy, they reappear. There is a plush toy resembling the Postman Pig. He does not appear in the newer version of Angry Birds. He is (possibly) the only pig who isn't antagonistic.

Trivia

 * The Postman Pig is the only pig that has nothing to do with the eggs being stolen.