Biggest and Baddest

In the first episode of the series, Niall travels to Venezuela to study anacondas.

In Nepal, Niall looks for tigers and visits a community that believes it is being terrorised by a large cat.

Niall goes to Darwin, Australia to capture a saltwater crocodile and take its measurements.

Niall tracks elephants in Nepal's Bardiya National Park, the largest national park in the lowland Terai.

Niall heads to Louisiana to study feral hogs, collecting DNA to determine their origins and biology.