A BBC camera team has uncovered the highest population of tigers in the world, at 4000m in Bhutan.
The crew says it is the first evidence that the cats - usually jungle-dwelling animals - can live and breed at high altitude.
"This is such a significant discovery for tiger survival," said wildlife cameraman Gordon Buchanan, according to the Guardian newspaper.
"The tigers' behaviour suggests they are breeding and I am convinced that there must now be cubs somewhere on this mountain", he said.
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