These are Angry Birds plush toys spotted today on the sidewalks of New York City today.

These stuffed birds seem too light to knock down any towers made of glass, brick or wood.

They're prototypes for the official product coming in 2011, a tipster tells Kotaku.

For those without iPhones, Androids and whatnot, Angry Birds is a physics based game involving catapulting round birds into structures the player hopes to topple. It has been one of the hottest chart-topping games on mobile devices for many months.