A group of giant river otters, an endangered species, emerge from the waters of Cocococha, an oxbow lake in the Tambopata National Park of southeast Peru. Researchers fear these otters, at the top of the food chain in this part of the Amazon, could be harmed by a buildup of mercury in fish.
http://www.sacbee.com/2012/12/07/5039709/peru.html
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