Natural World - Season 35 (2017)

Strand of documentaries on wildlife and the environment.

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.

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Helen Macdonald, the author of bestselling novel H is for Hawk, deals with the loss of her father by focusing on the art of falconry and training a goshawk while also taking care of its family.

On one side of the Jura Mountains there are ants colonies at war and the other home to a huge empire of ants, believed to be one of the largest animal societies in the world, where over a billion ants from rival colonies live in peace.