Departments of Physiology and *Zoology, Monash University, Clayton, Victoria, Australia
(Received 24 February 1976)
In natural populations of the shrew-like marsupial Antechinus stuartii all the males die within 3 weeks of the beginning of a single mating period in late winter. Males captured before this period begins and caged singly survive well beyond the time of natural mortality. During the mating period the males become extremely aggressive; vagrancy and interactions increase greatly and copulatory activity is frequent and prolonged (Woolley, 1966, Wood, 1970; Braithwaite, 1974). This is associated with evidence of increased adrenocortical activity (Barnett, 1973). Administration of cortisol to males captured and caged singly before the breeding period causes a significant dose-related mortality (Bradley, McDonald & Lee, 1975). However, the mortality is only 45% even when the plasma total corticosteroid concentration is well above the natural breeding level. Also, the plasma corticosteroid concentration of females in natural populations is
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