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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This book has large color photographs of sea animals, from plankton to clownfish to orcas.

这本书有许多海洋动物的彩色照片，从浮游生物到小丑鱼乃至逆戟鲸。

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But luckily for the larger whale, the nearby orcas were Northern Residents that eat fish, not other whales.

BBC: A quest to see Canada��s orcas in the wild

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

BBC: Survey to seek out killer whales off Caithness coast

Little Big Man here had survived orcas, bears and eagles along his journey.

BBC: Eyeball to eyeball with Canada��s migrating salmon