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. Author manuscript; available in PMC: 2020 May 15.
Published in final edited form as: Physiol Behav. 2019 Feb 7;204:20–26. doi: 10.1016/j.physbeh.2019.02.007

Figure 2.

Figure 2.

Body mass (A), area of the cloacal protuberance (length x width, B) and plasma testosterone concentrations before Log10 transformation (C) measured at the pretest (two months before treatment) and at the time of brain collection after two days of exposure to long days and treatment with Silastic™ implants filled with testosterone or left empty as controls. The mass of the syrinx measured at the time of brain collection is also shown in panel (D). All data are represented by their mean ± SEM. ***= p<0.001.