Little is known on the giraffe’s reproductive behaviour, particularly observations of male sexual behaviour are scarce. Most information results from studies on captive animals, and observations of free-ranging giraffes were mainly focused on social structure within herds and only yield limited data on the bulls‘ tendency of roaming between cows’ herds. In addition, no data was available on endocrine mechanisms which modulate male reproductive behaviour. Male endocrinology in terms of androgens has only been studied on culled animals, hence no