However, if safe areas like those prey animals have in the wild are provided, the prey population drops to low level but not extinction.

然而，如果能给被捕食的动物提供一些它们在野外时那样的安全区域，它们的数量会降到很低但不灭绝。

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The real extinction problem, he says, is human population pressure: habitat destruction, pesticide abuse, overharvesting, and species invasion.

他说，真正的灭绝问题是人类的人口压力：居住地的破坏、滥用杀虫剂、过度捕杀、物种入侵等。

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So space constraints likely kept population Numbers low-making the giant crocs vulnerable to extinction in tough times.

对空间的需求很可能导致其种群数量偏低，以致于在遭遇困难时期，这些巨型鳄鱼更容易灭绝。

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Mr Jonga said the demand needed to be met and not shunned, adding that there were ways of doing this without driving the rhino population to extinction.

BBC: Could legalising horn trade save rhinos?

But the overall eel population is not in danger of extinction (though some individual species are), so the authorities decline to protect them.

ECONOMIST: Slithery creatures, strangely determined

They are just tired of being hectored by scientists proclaiming certain apocalypses that never pan out: Examples include acid rain and the death of the forest, asteroids, the population bomb, and a catastrophic extinction of species that has eluded detection.

FORBES: Sound, Fury And The Policy Of Climate Change