Logo
Home
language
Loading...

听力练习

听力/Video/MinuteEarth/The Coyote Paradox

The Coyote Paradox

选择学习模式:

Highlight:

3000 Oxford Words4000 IELTS Words5000 Oxford Words3000 Common Words1000 TOEIC Words5000 TOEFL Words

字幕 (15)

0:00I’m going to explain that we shouldn’t  be trying to exterminate coyotes because  
0:04doing that actually makes more of them. Coyote packs tend to be like small families.  
0:09And in a typical pack of six or so, only the  dominant female tends to produce pups. The  
0:14rest of the pack are often the equivalent of the  alpha’s teenage children. They are often mature,  
0:18but still hang around and hunt with their  parents. And in this family pack, the younger  
0:22females don’t have their own pups. Instead,  the subordinate females go through bizarre,  
0:27“fake pregnancies” every breeding season in which  they go through all the stages of pregnancy, but  
0:32they don't actually produce pups. They don’t even  need to have mated to do this. And it’s odd, but  
0:38it does serve a purpose – it likely primes them  to act maternally toward their new brothers and  
0:42sisters, which probably increases group cohesion. But when the dominant female dies and the pack  
0:48scatters, her daughters all go out, find mates,  and start getting pregnant, for real this time.  
0:53And then they become the dominant females of their  own, new packs. And get this: younger females tend  
0:58to have litters that are double the size of the  older alphas. So instead of reducing the number  
1:02of coyotes, a hunter can actually increase the  number of coyotes. Because fighting coyotes is  
1:08like fighting the mythological hydra – every  coyote you kill gets replaced by several more.