| seasonal variation in hormonal responses of timber rattlesnakes (crotalus horridus) to reproductive and environmental stressors. | data addressing adrenocortical modulation across taxonomic groups are limited, especially with regard to how female reproductive condition influences the sensitivity of the hypothalamus-pituitary-adrenal axis. we investigated seasonal and reproductive variation in basal and stress-induced hormone profiles in a population of free-ranging timber rattlesnakes (crotalus horridus) in north-central pennsylvania during spring (i.e., may), summer (i.e., july), and early fall (i.e., september). baseline ... | 2009 | 19363617 |