Figure from Reproductive endocrinology of free-living Adélie penguins at Torgersen Island, Antarctica

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Figure 2. Body mass of ( A ) focal male Adélie penguins and ( B ) focal females through the reproductive season. Crosses indicate body masses of fasting bird in early stages of reproduction. The line is a linear regression of body mass against julian day and has the equation Y=17.705-0.0429 x julian day (r2=.60) for males and Y=15.97-0.038 x julian day (r2=0.364) for females. Large open circles during October and November indicate the masses of birds that were mated but did not ever have eggs in the nest. Small filled circles indicate the masses of birds that were caring for eggs and chicks but routinely leaving the colony to forage.