标签：predator 相关文章
[Songbird and traffic noise] It's hard to be a bird in our human-dominated world. You can barely hear yourself sing, let along hear the songs of your friends and you can forget about hearing a predator. Noise is almost everywhere. Especially noise fr
2016年Scientific American(九)月
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
2016年Scientific American(八)月
Humans aren't the only species that forms friendships. Lots of animals prefer to spend their time only with certain individuals. It's all very well showing that you do get social relationships and social bonds forming, but why on earth would you form
2017年Scientific American(二)月
The tropical night descends on a quiet beach, but just off shore, beneath the tranquil waves things are busy. A group of research scientists are scouring a coral reef looking for fish, or more accurately, the parasitic passengers attached to the fish
自然百科2009年
Meanwhile, the ground sloth, like the mastodons, must eat most of the day to fuel its huge bulk. This may be the ice age, but by midday, temperatures soar, drawing another predator to the spring to drinkthe notorious saber-toothed cat. Most creatures
探索与发现2013年
Why Do Zebras Have Stripes? For many animals, camouflage is an important part of survival. A leopards spotted coat and a polar bears white fur help them blend into their respective environments. But a zebras bold stripes cant help to disguise it in i
英语听力文摘 English Digest
By Paul Sisco Washington 25 July 2007 At the beginning of the 20th century there were more than a million lions worldwide. Today there are less than 30,000 in the wild. The remaining lions are increasingly threatened by habitat loss, hunting, and era
2007年VOA标准英语（七月）
Pakistani military officials say they have recovered an American drone aircraft that crashed in a village near the Afghan border. VOA's Barry Newhouse reports from Islamabad that locals in the region say they shot down the drone, but the military is
VOA标准英语2008年（九月）
By Margaret Besheer United Nations 27 October 2009 Air Force MQ-9 Reaper takes off from Kandahar Air Base, Afghanistan, 13 March 2009 The U.N. Special Rapporteur on extrajudicial killings says the use of armed unmanned aircraft by the United States
VOA标准英语2009年(十月)
AUDIE CORNISH, HOST: Sometimes good research can get done with a tool so simple a child could do it. For instance, scientists around the world recently set out thousands of fake caterpillars made from clay. NPR's Nell Greenfieldboyce explains why. NE
2017年NPR美国国家公共电台5月
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
探索与发现2013年
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
探索与发现2013年
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
探索与发现2013年
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
探索与发现2013年
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
探索与发现2013年
--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
探索与发现2013年
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
探索与发现2013年
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
探索与发现2013年
Don: All right, Yael, you're a moth. And mating for you is a big deal because it takes eight or nine hours. So the last thing you want is for some predator to interrupt you and your mate in the act. Yael: I'm guessing that's true not just for moths.
英语听力文摘 English Digest
Rapid Evolution and Population Dynamics 种群（population）指在一定时间内占据一定空间的同种生物的所有个体。种群中的个体并不是机械地集合在一起，而是彼此可以交配，并通过繁殖将各自的基因传给
英语听力文摘 English Digest