This documentary tells the tenuous survivor story of the kākāpō: the nocturnal flightless green parrot with "big sideburns and Victorian gentlemen's face" (as comedian Stephen Fry put it). A sole breeding population for the evolutionary oddity (the world's largest parrot; it can live up to 120 years) is marooned on remote Codfish Island. The award-winning film had rare access to the recovery programme and its dramatic challenges. This excerpt sees a rugged journey to the island to search for a kākāpō named 'Bill', and witnesses the "bizarre ballad" of its mating boom.