Factual
1 hr 1 min
One of nature's greatest unsolved mysteries: The Bewick's swan, in dramatic decline. No one's known why, until now. Follow extreme sportswoman Sacha Dench and award winning wildlife cameraman Benjamin Sadd as they follow swans Charlotte, Daisy-Clarke and Leho over 7000km by air, land and sea on a journey where both humans and swans will be pushed to the very limits of their endurance.