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Box plots displaying concentrations of corticosterone in rump feathers (CORTf) of male cerulean warblers from two age classes collected from 2008–10 in the Cumberland Mountains, TN, USA. The CORTf concentration differed between age classes when controlling for year (χ2 = 5.83, d.f. = 1,54, P = 0.02). ASY, after-second-year; SY, second-year.
