Sonny the Cuckoo Bird is the cartoon mascot for Cocoa Puffs, a General Mills-produced cereal. He often appears in its television commercials. His catch phrase is "I'm cuckoo for Cocoa Puffs!". In the commercials, Sonny attempts to concentrate on a normal task and ends up coming across some reference to Cocoa Puffs themselves, usually described as "crunchy, munchy, and chocolatey", and bursts with enthusiasm, exclaiming his catch phrase.

In "Death Has a Shadow", as well as the original Pilot Pitch, Peter Griffin auditions to play Sonny in a Cocoa Puffs commercial. He gets fired for repeatedly saying his line wrong.

In "The Former Life of Brian", Sonny aims to be a NASA astronaut. He is subjected to a psychological evaluation, where the scientist presents to him a bowl of the cereal to test his reaction. The bird, however, refuses to take the bait.