Icelandic orcas (IMAGE)

McGill University

Icelandic orcas

Caption

These killer whales may appear healthy, but a new study has found extremely high levels of PCB contamination in some of the whales. There was a 300-fold difference between the levels of PCBs among the most contaminated orcas compared to the least contaminated ones. The variation was mainly due to their eating habits.

Credit

Filipa Samarra - Icelandic Orca Project

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