Welcome to the BBC Worldwide Advent Calendar! Were wishing you the best of the festive season this year with an interactive calendar, and this video forms part of a series of 25 of the best Christmas or Winter-themed videos available on YouTube. Click anywhere on the video to return to the Advent Calendar and open more doors. For more high quality videos, visit http://www.youtube.com/BBCWorldwide. For Thursday 3rd December, David Attenborough explains how before man weapons, the Siberian tiger was the most powerful killer on Earth in a clip taken from epic natural history series The Life of Mammals.
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