BBC UKChina Silent Hunters 杀人鲸的狡猾捕食策略
[audio]http://language.chinadaily.com.cn/bbc/media_english/assets_9335575/me_127_killer_whale_report_110304_me_127_orcas_report_au_bb.mp3[/audio][font=Verdana, 宋体, helvetica, arial, sans-serif][p=30, 2, left]Background: 虎鲸，俗称杀人鲸，本是非常善于交流的物种。不过最近，英国圣安德鲁斯大学的研究人员发现，虎鲸在捕食过程中不发出任何声音，以确保不被猎物发现。[/p][p=30, 2, left]Killer whales [b]whistle [/b]to talk to each other and click to find their way around. It's the [b]echoes [/b]from these clicks that help the animals to map their [b]surroundings [/b]and to [b]pinpoint [/b]the location of their next meal.[/p]
[p=30, 2, left]But while one type of killer whale eats fish, the other hunts marine[b]mammals[/b], including seals and porpoises. A [b]shoal [/b]of salmon can't hear the clicking of an approaching killer whale, but the mammals, with their highly sensitive underwater hearing, can.[/p][p=30, 2, left]The researchers used underwater microphones to listen to killer whales hunting seals off the coast of Alaska. They found that the animals [b]fell [/b]completely [b]silent [/b]when they were hunting. But, somehow, they still managed to organise themselves into groups - often [b]spreading out[/b] up to a mile apart, before coming back together and calling loudly to each other while they shared their [b]catch[/b].[/p][p=30, 2, left]The scientists now hope to attach satellite trackers to individual killer whales, to find out more about this [b]stealthy [/b]behaviour.[/p][/font] pinpoint v 准确地找出或描述
shoal n 鱼群
stealthy adj 悄悄的;鬼鬼祟祟的
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