Plastic ingestion has also been observed in Franciscana dolphins
(Pontoporia blainvillei) that inhabit the same estuary. Denuncio
et al. (2011) reported that dolphins incidentally captured in estuarine
waters ingested more plastic than dolphins from adjoining,
marine waters. Turtles and dolphins feed on different prey (jellyfish
and fish, respectively); this also suggests that plastic ingestion
may not occur because animals fail to distinguish it from prey.