Why are the birds so angry?

A friend of my wife has a game called "Angry Birds" on her cell phone. I have never played it, but she is addicted. If you have never seen it, you use a giant slingshot to shoot these angry birds at green blobs (which she says are pigs). So I asked her "Why are the birds angry at the pigs?" ... show more A friend of my wife has a game called "Angry Birds" on her cell phone. I have never played it, but she is addicted. If you have never seen it, you use a giant slingshot to shoot these angry birds at green blobs (which she says are pigs). So I asked her "Why are the birds angry at the pigs?" She has no idea. Anyone know?
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