This 29 November 2019 video says about itself:
Swamp Tigers: Rare footage of the royal Bengal Tiger | Free Documentary Nature
This multi-award-winning film documents the life of the most elusive of cats, the royal Bengal, or ‘swamp tigers’ of the Sundarbans. Mike Herd’s painstaking dedication resulted in a mesmerizing film, which shows rare and intimate footage of the last true lord of the jungle. Elaborate night-sight equipment shows a tigress covering a carcass with leaves and we are truly unprepared for the many revelations that follow.