As the natural world faces unprecedented pressures, who are the conservation heroes working on the front line to protect our most precious species? Mike Gunton hears from BBC Factual Commissioner Jack Bootle on why human stories are so important to the Planet Earth brand, while conservationist Carla Daniel shares how she makes sure sea turtles remain safe on the busy streets of Barbados. Chimp expert Matt McLennan describes how his conservation work helped to bring a Planet Earth III sequence to our screens, and Sir David Attenborough offers his own thoughts on conservation heroes.