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Fig. 3. Regressions of body mass (A), bill length (B), flipper length (C) and foot
length (D) on time from hatching in 30 non-labelled chicks (open circles) and
in the four labelled chicks studied in the present paper (filled circles).
Overlapping confidence intervals (CI) of regression slopes (except for bill
length) indicate a normal growth of labelled chicks.