That's because very large animals have a slow rate of reproduction, so all you have to do is remove a few young females from the herd, and you can, fairly quickly, significantly reduce the population.

那是因为大型生物的繁殖速度十分缓慢，所以只要除去象群中的几头年轻的母象，它们的数量就会大幅的下降。

youdao

That is some time after its neighbour, Macau, which has a higher reproduction rate, but a much smaller population.

（与生育率更高、人口要少很多的邻居澳门相比，这一时间要推后一些）。

youdao

The result revealed that there was obviously changed in age structure and reproduction structure of L. lagurus with the decline of the population quantity.

结果表明，随着草原兔尾鼠数量的下降，种群的年龄结构和繁殖结构都发生了明显的变化。

youdao

It is impossible for the species to be a viable population by natural reproduction.

BBC: Earth News - Giant fish 'verges on extinction'

Perhaps more technically, the family lines that focused on something other than reproduction died out as a fraction of the population.

FORBES: Lemin Wu, Economic Growth and Why Humanity Can't Have Nice Things

The rapid reproduction of bacteria means there is always a chance that a population of microbes will develop which is antibiotic resistant.

BBC: Animals and antibiotics: the risks