At 14 tonnes, the Straight-tusked elephant was the largest to ever walk the earth. Today’s largest are the African ‘Super Tuskers’. Joining a conservation team in Kenya’s Amboseli-Tsavo Ecosystem, Dan’s trying to find them.

Dan crosses thousands of miles of Botswana's Okavango Delta, in the territory of the region’s massive males. Understanding how far males roam could help build ‘wildlife corridors’ that keep these lions falling to the same fate as the giant American Cave Lion.

Searching the tranquil waters of the Patanal, Dan joins serpent scientist Julianna Terra to survey Green Anacondas. Could today’s huge females be approaching the prehistoric proportions of Titanoboa?

Searching the tranquil waters of the Patanal, Dan joins serpent scientist Julianna Terra to survey Green Anacondas. Could today’s huge females be approaching the prehistoric proportions of Titanoboa?

Dan experiences the power of the Great Whites that feed on the Southern Australian fur seals. But Megalodon once shared the waters with the great white, so what happened!