Set in the tropical rainforests of Central America, this film reveals the unseen behaviour of jaguars, vampires, margays, kinkajous and other strange animals that spring to life after dark. The documentary was filmed in Belize, over the course of a year, by resident film-makers Richard Foster and Carol Farneti Foster. They used infra-red cameras and powerful software which converts the ultrasonic calls of bats into distinctive visual patterns on a computer screen.