Sir David Attenborough is preying on viewers' nerves with the stuff of natural world nightmares in an episode of BBC nature documentary Planet Earth II.
The episode includes cute prey being chased along sheer cliff faces by foxes, adorable bears dodging avalanches – and reaches a harrowing crescendo with a snow leopard fight over a mate, as the mother of an adolescent cub was set upon by two males.
David Attenborough presents a documentary series exploring how animals meet the challenges of surviving in the most iconic habitats on earth.
Below is a preview of one of the episodes called "Mountains"
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