In Malaysia's remote rainforests, Declan, Vianet and Aldo look for the world's rarest tigers in hopes of defending them from ruthless poachers.

Deep in the desert of Mongolia, the team plays the ultimate game of hide-and-seek, searching for Gobi bears before they disappear forever.

On the island of Java, the crew dodges crocodiles to try and find the world's rarest rhinos in a bid to help them breed again.

The team ships out to Gabon's dense jungles to track down an entirely wild troop of gorillas - with a surprising plan to save them from extinction.

In Armenia's rugged mountains, the team pursues one of the most mysterious and majestic predators: Caucasian leopards.

Battling the North Atlantic, the team squeezes into the belly of a boat to find endangered whales with the help of emerging technology.