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Because the ocean is full of mercury, and these animals are filter feeders with long life spans, they accumulate MASSIVE quantities of mercury in their bodies. Japan has been hunting whale for their meat, but now the meat is so toxic they can't even eat it. They still harvest and can it however. Somewhere is a warehouse full of illegally harvested whale meat that nobody can safely eat just sitting for all eternity.
Oh yeah, dolphins have started showing signs of mercury related brain illnesses like Alzheimer and dementia.