This show has had people gripped of a Sunday evening the last few weeks, and as we are now reaching the half-way point of the series, you had better tune in to see what the fuss is about. Sir David Attenborough narrates this remarkable documentary series that is the BBC's first ever show to be shot in the Ultra High Definition format. In tonight's episode, there is footage of plants and animals that live in jungles, one of the hardest environments to thrive in, including strange fungi and creatures that glow in the dark which have never been captured on film before. There will also be recordings of caimans and the jaguars that prey on them, freshwater dolphins that swim through flooded forests, undergrowth-dwelling frogs that have to defend themselves against wasps, and the Indri, the world's largest living lemur, which inhabits the forests of Madagascar.