An upstream migration fought with danger: freshwater sawfish fending off sharks and crocodiles Morgan, David L. ; Somaweera, Ruchira ; Gleiss, Adrian C. ; Beatty, Stephen J. ; Whitty, Jeff M. Abstract Publication: Ecology Pub Date: May 2017 DOI: 10.1002/ecy.1737 Bibcode: 2017Ecol...98.1465M