A "lost" population of tigers has been caught on camera living in the mountains of Bhutan, a discovery that could be crucial for the big cats' survival.
Their discovery has stunned experts, as the tigers are living at a higher altitude than any others known and appear to be successfully breeding.
Their presence in the Bhutan highlands has been confirmed by footage taken by a BBC natural history camera crew.
Creating a nature reserve around the tigers could connect up fragmented populations across Asia, preventing the extinction of the world's biggest cat.
Lost Land of the Tiger will be broadcast on BBC One at 21.00BST on Tuesday 21st, Wednesday 22nd and Thursday 23rd September.