From the movie's official website:
Did any of my UK readers happen to catch the special television version on Christmas or New Year's Day?
In Flying Monsters 3D, Sir David Attenborough the world’s leading naturalist, sets out to uncover the truth about the enigmatic pterosaurs, whose wingspans of up to 40 feet were equal to that of a modern day jet plane.
The central question and one of the greatest mysteries in palaeontology is: how and why did pterosaurs fly? How did creatures the size of giraffes defy gravity and soar
through prehistoric skies?
Driven by the information he finds as he attempts to answer these questions, Attenborough starts to unravel one of science’s more enduring mysteries, discovering that the marvel of pterosaur flight has evolutionary echoes that resonate even today.