In this film for the BBC’s Saving Planet Earth campaign, former SAS Commando Chris Ryan travels across the North to discover how three of the species closest to his heart are under threat: the nimble red squirrel, Britain’s only venomous snake, the adder, and the graceful and beautiful hen harrier. In his journey to discover how these precious and threatened species can be saved, Chris meets the conservationists and wildlife experts fighting to ensure the animals’ survival.