http://news.nationalgeographic.com/news/2012/04/130412-diseases-health-animals-science
-environment-oceans/
Marine wildlife vetinarians have been handling a lot
of cases with dead otters. They have one by one
ruled out different types of deaths. They then found
out that the otters were poisoned by a toxin called
microcystin which comes from human waste and
also from fertilizer. The sewage and fertilizer runoff
into lake and rivers and end up in things like fish and
shellfish. After the fish make their way into the ocean
the otters then eat them, get poisoned and could die.
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