January and February. Mean CORT also differed between months (F4,30 = 12.701; P < 0.001), averaging 11.24 ng/mL in October, peaking in November (15.92 ng/mL) and decreasing to values around 6.79 ng/mL in January and February. Mean T also differed between months (F4,30 = 7.670; P < 0.001), averaging 55.31 ng/mL in October and decreasing to values around 40.28 ng/mL in November, January, and February. Calling rates and plasma levels of both hormones reached minimum values at the end of the breeding season (March).