一些物种的天敌非常少。

Some species have remarkably few natural ___predators.

在野外，隐秘的捕食者可能只在攻击时才会暴露自己。

In the wild, a stealthy ___predator may only reveal itself when attacking.

狮子通常被视为其生态系统中的顶级捕食者。

The lion is often regarded as an apex ___predator in its ecosystem.