Sexually selected male plumage color is testosterone dependent in a tropical passerine bird, the red-backed fairy-wren (Malurus melanocephalus).

Although there was a marginally non-significant difference in body condition between treatments ( Fig S2 ; F 2,74 = 3.06, p = 0.053), T male body condition was not significantly lower than that of ASY males, who were in significantly better condition than control males (Student's t; α = 0.05).

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In contrast, control males showed a trend for increase in % red/black (χ 2 = 3.33, df = 1, p = 0.068; Fig. 2B ), consequence of feather plucking as feathers grew back red/black on control birds that gained breeding positions (N = 3) and brown on the control bird that remained as a natal auxiliary (N = 1).

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