Before man ruled the world, Earth was a land of giants. Count down the biggest beasts of their kindeeeBeforemanruledtheworld,Earthwasalandofgiants.Countdownthebiggestbeastsoftheirkindtoeverroamtheplanetinthiseye-openingoriginalspecial,anduncoverthesecretlivesofthesesuper-sizedspecies.Birdswithplane-lengthwingspans,dinosaursrivalingaBoeing737;thisstunningCGIspecialgoesinsearchofthetruthbehindthesemonsters,countingdown...详情