2. Angry Birds is a casual puzzle game developed by Rovio, which first appeared on iOS in June 2009. The game tells a series of stories about birds and fat pigs with the background of birds retaliating against fat pigs who stole birds' eggs.

On March 20th16th18th, former UN Secretary-General Ban Ki-moon appointed Hong Niao in the game as the green honorary ambassador. In the same year, it was adapted into the movie Angry Birds.