Angry Birds and Green Pigs

Now, I am sure that I am not the only one out there who is clueless about Angry Birds, but I will admit that I had to do a little research and even asked a number of "experts" (namely, the four year olds at my preschool!) to figure out how to make this cake.  The birthday boy's favorite characters in the game are the King Pig and the black bird.  From what I can tell, that black bird is the best because he blows up!  The one thing I wonder, though, is why those pigs are green instead of pink.  hmmmmm.....