反馈建议 切换旧版 去做题 结束训练
全文精听 逐句精听
句间停顿： 关
  • 关
  • 1S
  • 3S
  • 5S
语速： x 1.0
  • 速度0.8X
  • 速度1.0X
  • 速度1.2X
  • 速度1.5X
  • 速度1.8X
  • 速度2X
始终显示原文
欢迎使用 KMF 精听精研
坚持练习精听，反复听、吃透每个句子，能够快速 提升听力能力
开始精听
或按 「 空格」开始播放

段落1

This is Scientific American's 60-Second Science. I'm Steve Mirsky.

点击显示原文

隐藏原文=

Coyotes. In the last two decades they've become common in almost every North American metropolitan area.

点击显示原文

隐藏原文=

Stanley Gehrt is a wildlife ecologist at Ohio State University who studies urban coyotes in Chicago.

点击显示原文

隐藏原文=

He spoke October 20th at the ScienceWriters2014 meeting in Columbus, Ohio, about why coyotes are so good at adapting to various environments:

点击显示原文

隐藏原文=

"For mammalian carnivores, the 20-kilogram point, 20 to 21 kilograms, is the key here.

点击显示原文

隐藏原文=

Because mammalian predators that stay below that number can exist on prey smaller than them.

点击显示原文

隐藏原文=

And they're often solitary or they only form small groups.

点击显示原文

隐藏原文=

And they can scavenge and be able to meet their energetic needs.

点击显示原文

隐藏原文=

"But they exceed 20 kilograms in body weight, now they have to eat prey that's their size or larger to be able to maintain their energetic requirement.

点击显示原文

隐藏原文=

So they often are hunting prey larger than them, which requires often sociality.

点击显示原文

隐藏原文=

And so that's why wolves rely a lot on deer, moose, elk, that they have to hunt cooperatively.

点击显示原文

隐藏原文=

"Some of our coyotes get right to that 20-kilogram level,

点击显示原文

隐藏原文=

that's the perfect spot, because what they can do is they can either exist quite well on prey smaller than them,

点击显示原文

隐藏原文=

that's typically what they do, or if they have to, if the conditions dictate it, then they can hunt and consume prey larger than them.

点击显示原文

隐藏原文=

So they can do whatever they need to do.

点击显示原文

隐藏原文=

As opposed to the others, you'll never see foxes taking down prey that are their size or larger, or rarely will you see that.

点击显示原文

隐藏原文=

And you won't see wolves living off of really small prey, rodents, for any length of time, they will temporarily but not for a long time.

点击显示原文

隐藏原文=

So this kind of sets the stage for the perfect predator here.

点击显示原文

隐藏原文=

"Also, being in the middle means that they are also subjected to predation at times by the larger predators such as wolves and mountain lions, and the occasional bear.

点击显示原文

隐藏原文=

So they have to be extra good at hunting their own prey as well as not becoming prey themselves.

点击显示原文

隐藏原文=

So it creates a super-smart animal."

点击显示原文

隐藏原文=

For Scientific American's 60-Second Science. I'm Steve Mirsky.

点击显示原文

隐藏原文=
[ < 空格 > ]
当前句 /
/
  • 段落1
  • 第 1 句
  • 第 2 句
  • 第 3 句
  • 第 4 句
  • 第 5 句
  • 第 6 句
  • 第 7 句
  • 第 8 句
  • 第 9 句
  • 第 10 句
  • 第 11 句
  • 第 12 句
  • 第 13 句
  • 第 14 句
  • 第 15 句
  • 第 16 句
  • 第 17 句
  • 第 18 句
  • 第 19 句
  • 第 20 句
  • 第 21 句
  • 第 22 句

+ 创建收藏夹
保存 取消