Justin Anderson - Wilderness Songs: Nature's Hidden Sounds

The wildlife documentary maker (BBC Planet Earth series, National Geographic, Discovery Channel) as he discusses his quest to track down the most unusual and impressive natural sounds on the planet.

From blue whales who can converse across oceans to the elusive whistling of the Northern Lights, Justin has traveled the world to learn about the secrets and complexities of these natural soundscapes - and will even play us some of the sounds he recorded along the way.Talking to Tim Hubbard