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Testosterone is a key regulator in vertebrate development, physiology and behaviour. Whereas technology allows extraction of a wealth of genetic information from extant as well as extinct species, complementary information on steroid hormone levels may add a social, sexual and environmental context. Hair shafts have been previously used to sequence DNA from >50 000 14C years old Siberian woolly...
Androgens have been linked to social behaviour in males across many vertebrate species. Despite the lack of gender specificity in steroid hormones, the association of androgens with behaviour in females remains obscure. We analysed steroid hormone levels in male and female rock hyraxes, Procavia capensis, and found strong ties between androgens and cortisol in females but not in males, despite the...
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