Beforemanruledtheworld,Earthwasalandofgiants.Countdownthebiggestbeastsoftheirkindtoeverroamtheplanetinthiseye-openingoriginalspecial,anduncoverthesecretlivesofthesesuper-sizedspecies.Birdswithplane-lengthwingspans,dinosaursrivalingaBoeing737;thisstunningCGIspecialgoesinsearchofthetruthbehindthesemonsters,countingdown...
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