Piggies beware, Angry Birds are here, and they are....Angry! The joy on the twins' faces when they saw this cake is an affirmation as to why I make cakes, it makes people happy. It made me happy when I was making it. :D The cakes are both chocolate cake with Oreo Swiss Meringue Buttercream filling. The big birds and 2 biggest pigs are rice crispy treat centers, covered in fondant. The rest of the decorations are fondant.