Living in the depths of the New Guinea rainforest are the spectacular birds of paradise — creatures so beautiful that the first Europeans believed they must have fallen from heaven. Filming their bizarre courtship displays is the Holy Grail of wildlife film-makers: some perform like iridescent acrobats, others make hypnotic pulsing sounds as they quiver and vibrate. David Attenborough narrates the film. He has been entranced by these birds since he was a boy and he introduces a team of New Guinean naturalists as they embark on a gruelling expedition to try to film ten birds of paradise deep in the heart of the rainforest.