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Natural WorldThe animal kingdom possesses a fearsome arsenal, a variety of extreme weapons used in epic battles to gore, stab, crush and batter; for Professor Doug Emlen, it has been his lifetime's ambition to discover the secrets of nature's arms races.

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Now PlayingNatural WorldThe animal kingdom possesses a fearsome arsenal, a variety of extreme weapons used in epic battles to gore, stab, crush and batter; for Professor Doug Emlen, it has been his lifetime's ambition to discover the secrets of nature's arms races.0Natural WorldDavid Attenborough reveals never-before-screened secrets of giant armadillo life.