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Dolphins Reveal a Mysterious Hidden Sense: They Can Detect Electric Fields
(www.sciencealert.com)
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Didn't we know about this? Or was that another sea creature I'm thinking of?
The exact same thought crossed my mind when I read the title. I'm pretty sure this has been known for a while.
Edit: just read the article. The Guiana dolphin was found to have this ability several years ago, now they've found evidence of it in bottlenose dolphins.