Our Planet - Jungles

A myriad of micro-worlds, our jungles contain a bewildering diversity of life, all intricately linked. Life here has evolved to fit every niche, but due to deforestation they're disappearing faster than anywhere on earth. And once we lose any part of our jungles, we may lose species forever. We don’t need to clear any more of our jungles, so we need to manage and protect what we have left.

Alaska the Nutrient Cycle

Once they enter fresh water, chum salmon stop feeding and morph into an aggressive creature intent only on mating. After spawning, they die and their bodies become a source of nutrients for everything in the forest and sea.