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：2013-06-12 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：2013-06-07 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：2013-06-16 《恐龙的战争》3 顽强防御—1

In a prehistoric world, theres a war waging between herbivores and carnivores, and the plant-eaters are winning. They seem to break all of the rules. Theres nothing like them around today. For these plant-eating giants, survival relies on a battery o

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：2013-07-07 《恐龙的战争》3 顽强防御—10

19 meters tall and almost 30 meters long. Its neck alone is 4 stories long, a single vertebra almost as tall as a grown man. And a single thighbone weighs over half a ton. They seem to break all of the rules. Theres nothing like them around today. Co

英语听力：2013-07-03 《恐龙的战争》3 顽强防御—8

Interwoven layers can absorb the power of a piercing attack. Ankylosaurus pretty much was not afraid of anything because it would be very difficult to kill this beast. This creatures armor protects something else as well, its eyes. The eyelids of an

英语听力：2013-06-30 《恐龙的战争》3 顽强防御—7

just probably you stay stinking machine walking its way to the forest. Digesting plant fiber is the hardest job. In the eco-system an Ankylosaurus tackle that job, which is why it needed that enormous bulk, gigantic stomach and some divided intestine

英语听力：2013-06-28 《恐龙的战争》3 顽强防御—6

solid armor and dangerous weapons all deliver the power to stand up to huge predators. But in the world of Cretaceous, other defenders come equipped with tools not only to survive an attack but to defeat an opponent. Ankylosaurus is a herbivore desig

英语听力：2013-06-26 《恐龙的战争》3 顽强防御—5

Here we have one of the greatest predators nature has ever produced and one of the greatest defenders nature has ever produced sparring of with some truly awesome weaponry. Theres nothing like that in the world today. Triceratops most effective defen

英语听力：2013-06-23 《恐龙的战争》3 顽强防御—4

Sometimes they even take on members of their own specie in a battle for dominance. Its primary weapon is a pair of a-meter-long horns mounted on its skull. These horns make those of modern creatures look lightweight. A rhinos horn is made of hair, an

英语听力：2013-06-21 《恐龙的战争》3 顽强防御—3

Triceratops is an amazing animal simply because it was absolutely enormous. They had this big massive body with a big gut. So, you know, we are talking of an animal thats maybe four or five tons. A Triceratops is half as tall as a T-Rex, yet it weigh

英语听力：2013-06-19 《恐龙的战争》3 顽强防御—2

These plant eaters are no pushovers. They are no theyre no pansies. We have records, quite a few, of adult dinosaurian predators being killed by herbivores. It did happen. It happens today. Lions get kicked in the face and die from a single blow from

英语听力：2013-07-05 《恐龙的战争》3 顽强防御—9

The tip is designed not the split on impact. It absorbs the stress of all that raw power the hammer gives because its not solid bone. Instead, its honeycombed with soft tissue, marrow, blood and fact. Ankylosaurus combines steel-like protective plate

英语听力：2013-05-17 完美捕食 Perfect Predators —7

Attacking another T-Rex may seem like suicide, but a creature with such a voracious appetite has to find food by any means. Cannibalism is the rule. Its not the exception. If youre a carnivore and theres meat there, you take advantage of it. In fact,

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