Crocodile Blues (S27E04)

The gharial, the world's oldest crocodilian, is on the very edge of extinction. These bizarre fish-eating reptiles that live in India's rivers have been decimated by a mystery die-off. Reptile expert Rom Whitaker has spent several decades battling to save the gharial. He and his team attempt to discover the cause of the die-off and ensure the future of the species through breeding in captivity. (BBC)