Angry Birds is a video game franchise created by Jaako Iisalo for Rovio Entertainment. It centers around a flock of birds rivalling against a civilisation of green pigs, who often attempt to steal and eat the birds' nest of eggs. Games in the franchise are most commonly developed and published by Rovio for mobile devices, though several have been developed by other studios or released for other systems such as consoles or arcade machines. The franchise primarily consists of puzzle games, but also includes games in other genres such as racing, role-playing, and tile-matching. A majority of the games depict the titular birds as the playable protagonists, while the pigs usually serve as antagonists.