Orcas, or killer whales, are afflicted by bio-accumulation of toxins.

逆戟鲸，或称虎鲸，正饱受毒素生物积累作用的折磨。

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In 1986 he went to Augusta, Western Australia, where more than 100 killer whales had beached.

1986年，他去了西澳大利亚的奥古斯塔，那里有100多只虎鲸搁浅。

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As one of the most brutal predators, killer whales may not fit the image of a cultured creature.

作为最残忍的掠食者之一，虎鲸可能不符合文明动物的形象。

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The medals are adorned with Native Canadian icons and designs of killer whales.

VOA: standard.2010.02.16

Sea Watch said May was a peak time to see orcas, or killer whales.

BBC: Survey to seek out killer whales off Caithness coast

This video from Visit Norway shows divers exploring these waters, on the lookout for killer whales.

BBC: Mapping new worlds

Killer whales can grow up to 28 feet long and eat seals, dolphins and other whales.

BBC: NEWS | UK | Wales | South West Wales | Killer whales surprise twitchers