英语听力文摘 English Digest 735 不安的大象

（单词翻译）

Disturbed Elephants

Here’s a gruesome hypothetical: If you and your family were rounded up, and you were forced to watch as older relatives were killed, how would it affect you? Needless to say, you’d be horrified¹. You’d probably also be deeply disturbed for a long time afterwards. Maybe forever.

Regular Culling²

For some non human species, that grisly scenario³ is all too common. For instance, up until a few decades ago elephant populations were regularly culled⁴. That is, family groups were herded⁵ into a tight space so that hunters could shoot and kill the older individuals. The practice was actually meant to help elephants, because park officials worried they’d grow too numerous and overrun the area.

But research has shown that the surviving elephants are often deeply disturbed. One study found that elephants from a culled group had serious problems with social and other behaviors. For example, a group of orphaned⁶ male elephants killed more than one-hundred rhinoceroses⁷ over a decade — behavior that’s highly abnormal.

Lose Elders, Lose Educators

Another study found that culling survivors⁸ responded chaotically⁹ to elephant calls broadcast by scientists in a nearby jeep. The animals seemed at a loss — sometimes taking defensive¹⁰ measures, but not necessarily in response to calls from alien or more socially dominant¹¹ females, as they normally would.

Scientists speculate that’s because elephants typically learn these important behaviors from their elders. And when those elders are culled or poached, the younger elephants may not learn how to respond to potential threats. Elephants that don’t know how to defend themselves have less chance of surviving and reproducing. Although culling is no longer practiced, poaching is. And it may have similar effects.