And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover.

当一种猎物变得稀有时，如果捕猎者能够转向其他更容易找到的物种，这种转变可以让原来的猎物数量得到恢复。

youdao

The deer fell a prey to the lion.

鹿被狮子捕食了。

《新英汉大辞典》

What is the meaning of "a life for a prey"?

到底是甚么意思呢？

youdao

Bartholomew was increasingly a prey to melancholy, but did not let it show, to Hester or to anyone.

NEWYORKER: Faith

If you think about it, it makes sense for a prey animal to sleep on its feet ready to flee predators.

BBC: Sport - Do horses get jet lag?

But Southcorp, for all its heft, could also become a prey.

FORBES: Chateau Southcorp