Foraging mass gain in g (i.e. difference between evening and morning body mass; body mass of individuals was pooled for both mornings and evenings) of adult southern rockhopper penguins crossing the w
D0: start of the treatment. D7: 8th day of treatment. D15: 16th day of treatment. D21: 22h day of treatment. D29: 30th day of treatment. Changes in body weight in the different groups (*p < 0.05).