The Most Extreme Animals

The Most Extreme Animals Earth is a planet of extremes, extreme places and extreme animals, but some animals are more extreme than others. Join us as we count down to find the most unusual and the mos

英语听力：2013-03-24 恐龙之战之极限生存 Extreme Survivors—3

Its reputation for violence and terror is unmatched, but an infant T-Rex comes into the world better protected than most. If you say Tyrannosaurus Rex, I think of gentleness. I think of superb motherhood and a struggle to raise ones chicks. The dread

英语听力：2013-03-22 恐龙之战之极限生存 Extreme Survivors—2

I think its a very beautiful idea that you have this little egg thats surprisingly small and out of it comes a baby sauroposeidon thats about the size of a rabbit and in two or three decades, its gonna be a 50-ton adult. But why does this huge animal

英语听力：2013-03-20 恐龙之战之极限生存 Extreme Survivors—1

In a world of terrifying creatures, being small means facing danger at every turn. If you were a small animal, the late cretaceous would have been an awful time to be around. For a youngster, every day is a struggle to stay alive. Their only chance i

英语听力：2013-03-27 恐龙之战之极限生存 Extreme Survivors—4

Tyrannosaurus Rex when we think about it, we tend to think of the big adult because thats the skeletons that we see, but we know that they didnt hatch that way. Once those eggs hatched, weve got an animal thats maybe, you know, three feet long, maybe

英语听力：2013-03-29 恐龙之战之极限生存 Extreme Survivors—5

There probably werent many animals of Cretaceous that would dare to try to grab a baby Tyrannosaurus Rex. Quetzalcoatlus could probably manage it. If you see a stork on the Nile today eating a baby crocodile, you can imagine in your mind Quetzalcoatl

英语听力：2013-03-31 恐龙之战之极限生存 Extreme Survivors—6

When you start off coming out of the egg and youre less than, say, 2 feet long and you are in a world full of predators that are loving to crunch on you, then you need to get big fairly quickly. The future seems bleak for this dinosaur. With its life

英语听力：2013-04-03 恐龙之战之极限生存 Extreme Survivors—7

Male lions defend their cubs against rivals who see their offspring as future competition for food and mates. So its likely that an intelligent predator like T-Rex would do the same. Compared to prehistoric plant eaters, its cerebrum, the part of the

英语听力：2013-04-05 恐龙之战之极限生存 Extreme Survivors—8

T-Rex is impressive and it's powerful, but compare to Ankylosaurus, it is relatively lightly built. Protective plates made of bone and cartilage covered this lumbering creature from head to tail. Light, but extremely strong, the hide of Ankylosaurus

英语听力：2013-04-07 恐龙之战之极限生存 Extreme Survivors—9

And there is something else unusual about a T-Rexs nose. The nostrils are a huge 25 centimeters apart, which means T-Rex can smell in stereo. It can triangulate an odor and pinpoint its exact source. T-Rex could walk into a crowded auditorium and in

英语听力：2013-04-10 恐龙之战之极限生存 Extreme Survivors—10

One could imagine that the conflict between Tyrannosaurs and Triceratops may have been one of the greatest combats that nature has ever had. And this well-protected herbivore is everywhere. In fact in the Late Cretaceous, Triceratops outnumbered Tyra

英语听力：2013-04-14 恐龙之战之极限生存 Extreme Survivors—12

Like sea turtles who from the moment they hatch they are on their own. For predators, hatching time is a veritable feast. Even so, the strategy works. Carnivores gulp down virtually every hatchling, but a few do make it, not even the most voracious f

英语听力：2013-04-17 恐龙之战之极限生存 Extreme Survivors—13

Sauroposeidon probably had a brain about the size of a kittens, because it was not, unfortunately, a very smart animal. It didnt have to be. It was a food-processing plant. Sauroposeidons five senses are little more than a life-support system for the

英语听力：2013-04-19 恐龙之战之极限生存 Extreme Survivors—14

To eviscerate prey, Deinonychus uses both its hands and feet. These were animal that had weapons everywhere you go. Its ridiculous minor weaponry for animal like that size. Its clear its name of all for every reason to be able to dish a lot of damage

英语听力：2013-04-21 恐龙之战之极限生存 Extreme Survivors—15

But with both parents out searching for food, the nest is left unguarded and exposed. Triceratops may be a plant eater, but with a defenseless baby T. Rex around, it'll make an exception. Quetzalcoatlus is the largest flying carnivore in Earth's hist

英语听力：2013-04-24 恐龙之战之极限生存 Extreme Survivors—16

Even if the animail managed to survive, the wounds generated from the bite, the prey dinosaur would get weaker and sicker, and the predator could then hunt it down and kill it. Bitten by a T-Rex, and youre downfall, be it now or later. And once you a

英语听力：2013-04-26 恐龙之战之极限生存 Extreme Survivors—17

It's a digestive process more like those of carnivores. And Sauroposeidon has another trick for growing to mammoth proportions--hollow bones. Its backbone, neck, and ribs have walls just a few milometers thick. Even its limbs are far less dense than

英语听力：2013-04-28 恐龙之战之极限生存 Extreme Survivors—18

Tyrannosaurus Rex, though, lives in an entirely different world. A male devours a Triceratops carcass. Those powerful jaws smash into the meat of the animal. Those gigantic teeth pierce down through flesh. These well-rooted teeth are there to break i

英语听力：2013-04-12 恐龙之战之极限生存 Extreme Survivors—11

I mean, these guys were, frankly dumb as a fence post. Sauroposeidon does almost everything by instinct, including rearing or more accurately not rearing its children. It may seem cruel to just dig a hole and leave your eggs and wander on, but its a

英语听力：2013-05-01 恐龙之战之极限生存 Extreme Survivors—19

Dinosaurs ruled the earth for millions of years. They grew to almost unimaginable sizes,nd adapted to extreme environments all over the globe. These animals were very successful and really, some of the crowning achievements of evolution. And they do