Nature's Wildest Weapons: Horns,...
BBC TWO
Saturday 23 December 2017 11:10 - 12:10 (60 mins)
...Tusks and Antlers: Natural World. Professor Doug Emlen discovers the secrets of nature's arms races, what triggers them and what they can teach us. Also in HD. [S]
Nature's Wildest Weapons: Horns,... may be available on playback
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