In June 2017 we repeatedly encountered a group of about 20 mantas in our favorite Tuamotu atoll. We saw them several days in a row in the pass, feeding on tiny copepod crustaceans in the strong outgoing current. They didn't seem to mind our company, so we spent hours watching them.
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17/23: When you see such plankton-eating milkfish, watch out, there might be also mantas around.