Electric eels can produce 650 volts of electricity, enough to light a tree and a few extra fairy lights - or kill a fully grown man.
Markus Dernjatin, from the Helsinki Sea Life Centre in Findland, explained: "We wanted to conserve energy so we looked around for ways to be more green.
"Then it struck us that we have a free source of natural electricity right here in our tanks.
"Our electrician built a device that uses four plastic-encased steel probes to capture the eel's electrical discharge and feed it to the lights.
"At feeding time though it really powers up. You can hear the voltage increasing and the lights shine bright and steady," he added
http://web.orange.co.uk/article/quirkies/Electric_eels_light_up_Christmas
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