Prairies of Amazonia. The episode is set in South America where the Amazon used to stand in 5 million years time. It features three species: (1) Carakiller, a descendant of the caracara which has evolved to replace land predators; (2) Babookari, a descendant of the uakari which lives like baboons and has discovered how to catch fish; (3) Rattleback, a descendant of the agouti which has developed tough armour and can live through quickly-passing grass fires.