Here we provide information on the diet of juvenile green turtles from neritic developmental habitats in the South Atlantic that indicates the existence of a gradual dietary shift from a primarily carnivorous to a primarily herbivorous diet. Linear regression showed a relation between the size of turtles (n  =  22) and the proportion of vegetal matter in the diet, with smaller animals being predominantly carnivorous. We propose 3 hypotheses that could explain these observations.

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