The pigs try to steal the eggs from the birds in Angry Birds. The birds’ central mission is to recover their stolen eggs, which the green pigs take and guard inside fortified structures.
This simple premise drives the original 2009 physics-based puzzle game. Players launch different birds from a slingshot, using their distinct abilities to destroy wood, glass, and stone constructions and eliminate the pigs. The birds’ anger comes from the theft of their eggs, not from a dispute over feathers or food.
A common mix-up is the golden egg bonus content found in some levels. Those golden eggs are collectibles and rewards for players; they are not the ordinary nest eggs that motivate the birds’ attack. The franchise later expanded the story through television series, films, and spin-off games, but the egg-stealing conflict remains its defining setup.