Life’s a beach for the happy birds of Bird Island. They work, play, and raise their hatchlings without a care in the world. A few Angry Birds can ruffle some feathers, but that’s what anger-management classes are for. Red—the angriest of them all—doesn’t want to go to class. He’d rather be alone. Then a ship of pigs lands on the island and the birds welcome the fun-loving pigs. As m…