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

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Figure 1. The level of plasma testosterone, estradiol, and prolactin in focal Adélie penguins nesting during the 1995-1996 breeding season at Torgersen Island. Data for males ( A ) and females ( B ) are shown relative to the day on which the first egg was laid in the nest. A smoothing spline fit (lambda=10,000) was fit to the data for each hormone. The dashed lines demarcate incubation of the eggs. (ng/ml denotes nanograms per milliliter. pg/ml denotes picograms per milliliter.)