Bertie is on a stakeout deep in the jungles of the Central African Republic, searching for the biggest and most secretive of the forest elephants: the tuskers, huge males with tusks that reach down to the floor. Working with a specialist camera team and local elephant trackers, he sets up a filming HQ high in the rainforest canopy.

Bertie travels to Indonesia to dive amongst some of the most exquisite coral reefs left on Earth, hoping to catch a glimpse of one of the reef's most elusive predators: the mysterious devil ray. His best chance of finding one is to track down a huge annual spectacular, an anchovy feeding frenzy.