Natural World 2017-18 (S38E05) Supercharged Otters (720p HD, soft Eng subs)

Otters are playful, adaptable and champion swimmers - they've captivated cameraman Charlie Hamilton James for the last 25 years. He's filmed them more than anyone else and now, through the eyes of three orphaned river otters, a set of groundbreaking experiments and some incredible wild encounters, Charlie wants to reveal their survival secrets and exactly why he believes they're so special.

(with soft subtitles) 

First broadcast: 20 June 2017
Duration:  1 hour