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

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

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.

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.

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

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