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不知道大家听说过电鱼没有...它们往往生活在浑浊的水域当中，依靠发射电流探测出障碍物以及猎物的位置...原理和蝙蝠发出的超声波差不多...在今天的大千世界中，我们就来关注下这类不同

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装死的负鼠 Playing dead doesn't seem like much of a strategy, but it works for the opossum, commonly known as the possum. The possum is a rather unglamorous creature. It has big, black eyes, a pale pointy face and a hairless tail, like a rat's.

创新英语-Do You Suffer From Facebook depression?

A new study suggests that social media sites have created a new phenomenon known as Facebook depression. The American Academy of Pediatrics recently warned parents about the possible dangers of networking websites on their childrens mental health. Re

北师大版高中英语模块10--Unit29(2)-2

[00:00.00]2 The early bird catches the worm [00:04.80]The early bird may catch the worm-but people [00:07.60]who lie around in bed in the morning [00:10.06]and work into the evening are more intelligent, [00:13.28]according to Richard Roberts [00:14.

VOA标准英语2012--Hawaii's Birds Threatened by Invasive Predators, Habitat Loss

Hawaii's Birds Threatened by Invasive Predators, Habitat Loss Many people think of the Hawaiian islands as a Pacific paradise, a string of tropical islands lush with exotic flora and fauna. But the islands' native species - especially birds - have be

科学美国人60秒 SSS Humans Are Superpredators in the Landscape of Fear

Small carnivoreslike foxes or raccoons or badgersare themselves prey for larger predatorslike wolves. So they spend time hiding instead of hunting. This influence that big predators have on their ecosystem is called a landscape of fear. But humans ar

SSS 2012-07-24

This is Scientific American 60-second science.I'm Innmi Craft.Got a minute? Here's one way bites my get there next meal by ease dropping on flies having sex.That's eat a lot of seemingly undetectable flies.To find out how the winged memers find the i

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Albert has been a Crip since age 12. He is one of the first generations of the Los Angeles based Gang, a group known as the Original Baby Gangsters. His seniority puts him near the top of the Crips' national hierarchy. Here in Lebanon, he runs a crim

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Wildlife in South Africa As you first enter the bush, you'll no doubt be greeted by mischievous apes like the vervet monkey, the chacma baboon, often with a baby on its back. An almost guaranteed sigh

美联社新闻一分钟 2007-03-23

1. John Edwards is continuing his bid for the presidency as his wife now battles cancer. Elizabeth Edwards stood by her husband's side in North Carolina, revealing her cancer has returned. She was first diagnosed at the close of the 2004 campaign. 2

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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

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：2013-06-05 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：2013-06-07 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：2013-06-09 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

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The deep ocean has other sources of light than astronomical bodies, though. 除了天体，深海还有其他光源。 Three-quarters of marine organisms off the coast of California produce their own, and that is probably true in most oceans, 加利福

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GWEN IFILL: Now we turn to another angle of our continuing of climate change and its impact. Tonight, our science team looks at the toll it is taking on sea turtles and some of their tiniest offspring. We went to the coast of Southern Florida and cam

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SCOTT SIMON, HOST: Efforts to remove the gray wolf from the endangered species list across most of the lower 48 states hit a hurdle yesterday. A U.S. Fish and Wildlife Service panel said the scientific research is insufficient to make a decision. The