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Rights: Courtesy of the Vertebrate Zoology Division; YPM ICH.023326. Peabody Museum of Natural History, Yale University, New Haven, Connecticut, USA; peabody.yale.edu. Photography by Gregory Watkins-Colwell. Published 19 March 2014 Size: 240 KB Referencing Hub media

Glass eel – the see-through stage before it becomes an elver.