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Echeneis naucrates
These fish are more closely related to fusiliers than to sharks. Their sucker is really their top fin on its side that opens and closes to create a grip. The attachment is so strong that people use the remora to seek out and attach itself to a turtle so that they can reel it in (a living, conscious hook).
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This spotting could go in the Symbiotic Relationships mission at http://www.projectnoah.org/missions/7987...