Abstract
) is one of the smallest extant toothedwhales. This species, which lives in coastal waters of Argentina and Brazil and inthe estuaries of the La Plata and other river systems (Rice 1998, Culik 2004, Crespo2009), was formerly included in the so-called river-dolphins (Rice 1998). This arti-ficial group comprises extremely rare and endangered species as the Indus or Gangesriver-dolphin (
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