Why is Chuck angry in Angry Birds?

Chuck, the yellow bird in the popular mobile game Angry Birds, is portrayed as angry primarily due to the game's storyline. The birds' anger stems from their eggs being stolen by the green pigs, who are their antagonists throughout the series. Chuck and his fellow avian characters band together to retrieve their eggs from the pigs' clutches and protect their future offspring. This relentless theft by the pigs drives Chuck, along with the other birds, into a state of anger and fuels their determination to use themselves as projectiles in a slingshot to destroy the pigs' fortifications and defeat them to reclaim what is rightfully theirs.