I just saw this DVD review about Winged Migration.
Disappointing to say the least.

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"The film's worst flaw is a deceptive title card at the beginning, which says that no special effects were used to depict birds in flight. But halfway through the movie, we see a bird flying over the Earth from a satellite's point of view! These plucky little birds are flying in low Earth orbit, making it from France to Greenland in under a minute! The continents and oceans below are obviously computer-generated, and the birds are obviously digitally added to the picture.

Of course, the title card at the beginning was qualified. It didn't say there were no special effects, only that they weren't used to fake certain scenes of flight. But why create resentment by tricking the audience with half-promises? The faked CG scenes were unnecessary anyway. The movie would have been better off had it let the cinematography speak for itself. "