Another stunning look at the wonders of wildlife as Natural World tonight seeks out the Gharial crocodile.

This mighty reptile, which can grow up to 20ft in length and tip the scales at one ton, evolved with the dinosaurs more than 150 million years ago.

However, it’s now on the brink of extinction as the largest critically endangered animal on the Indian subcontinent. Filmed over a 12-month period, reptile expert and conservationist Rom Whitaker set out on a mission to solve the mystery of why numbers have rapidly declined.

Currently, fewer than 200 breeding adults live in Indian and Nepalese sanctuaries that aim to ensure the future of the species via a captive breeding programme.

From the safety of your armchair, enjoy Whitaker’s fascinating footage of the Gharial.