Can The Penguins Fly?

Flying penguins or Miracles of Evolution is a BBC film trailer made in 2008 as an April Fools' Day hoax. The film was advertised as compelling evidence for Charles Darwin's theory of evolution. It was largely set on King George Island which is 75 miles from Antarctica.
The Daily Telegraph wrote that the film was "an instant classic. It is accomplished work of this kind that guarantees the BBC its unique status."

The BBC website still claims that it may attempt to film the flying penguins again because the original film did not explain how such small birds, that are not used to flying, could survive long migrations over vast, stormy oceans.Miracles of Evolution was filmed with animated penguins for the occasion of April Fools' Day, and to promote the BBC iPlayer.

Making of Flying penguins

Flying penguins was made using diverse techniques and footage.
BBC producers used real footage of Adelies filmed in the Antarctic by the BBC. Animated penguins were then created, and to make them fly the animators used a flight pattern used by real birds that somewhat resemble penguins.

Terry Jones was filmed in a studio with fake snow on the floor and on his polar parka. Later this footage was combined with real footage taken in Antarctica and with the footage of animated penguins in flight.

via wikipedia