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  • 英语听力:2013-06-14 完美捕食 Perfect Predators —19

    --The irony for many predators is they are very concerned about injuring themselves. Even the toughest most well-armed man-eaters regularly come face to face with prey that can kill them. Whether you had the jaws of a Tyrannosaurus Rex, or are armed...

  • 英语听力:2013-06-12 完美捕食 Perfect Predators —18

    Other carnivores are even more dependent on cognitive thought. For protection, Deinonychus relies primarily on its brain. --The brain structure of Deinonychus and its role are just really quite remarkable. Relatively speaking, Deinonychus has one of...

  • 英语听力:2013-06-09 完美捕食 Perfect Predators —17

    Mighty carnivores ruled a dangerous world in the Cretaceous Period. But being a super predator like Tyrannosaurus Rex is not easy. Just surviving to adulthood is a major feat, one that takes a decade or more of killing and eating some of the meanest...

  • 英语听力:2013-06-07 完美捕食 Perfect Predators —16

    I think that a big pterosaur on the ground wouldve been spooky because they would be moving around on all fours. Theyd probably have those sort of quick, precise movements like birds, but theyd be huge. Quetzalcoatlus lives by its own rules. Most mea...

  • 英语听力:2013-06-05 完美捕食 Perfect Predators —15

    Nothing this large would achieve powered flight until the 20th century, 65 million years later. And Quetzalcoatlus still may hold the record for flight duration. Probably stay aloft for a week. Probably it could have gone for 25, 26,000 miles in a si...

  • 英语听力:2013-06-02 完美捕食 Perfect Predators —14

    propel this creature weighing as much as a grizzly bear, from a dead stop to a launch speed of 50 kilometers per hour all in a fraction of a second. I think that seeing a pterosaur like Quetzalcoatlus actually take off would have to be one of the mos...

  • 英语听力:2013-05-31 完美捕食 Perfect Predators —13

    Picture a living plane, and that gives you a sense of what Quetzalcoatlus would look like in life. And this is an animal that probably accelerates over 2.5Gs just on takeoff. Just beyond our comprehension. A Quetzalcoatlus is 10 times the weight of t...

  • 英语听力:2013-05-29 完美捕食 Perfect Predators —12

    Deinonychus instinctively knows to go for this giants weak spot, its neck. Youve got the windpipe there. Youve got the jugular vein, which if opened up will mean that that Sauroposeidon is dead meat. But death does not come quickly or pleasantly. For...

  • 英语听力:2013-05-26 完美捕食 Perfect Predators —11

    They are actually increasing their chance of getting a meal. Its a strategy still used today. Working together, lions will take on prey as big as a four-ton elephant, and they only have teeth and claws. Deinonychus employs an array of weaponry more p...

  • 英语听力:2013-05-24 完美捕食 Perfect Predators —10

    These Olympic capabilities come down to one simple anatomical feature, its tail. Half the length of its body, it acts like a built-in counterbalance. By flicking it from side to side, it can make a sharp turn at full speed. If you were to look at Dei...

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