Reproductive phenology (timing) is a heritable trait that confers a range of fitness or survival advantages. Giraffe (Giraffa spp.) breed year-round; however, some studies have suggested adaptive birth pulses, where demanding stages of reproduction coincide with seasonal increases in resource availability (phenological match). Here we use 3.5 years of demographic data to investigate the sociosexual behaviour and reproductive phenology of Angolan giraffe (G. g. angolensis) in the hyper arid northern Namib Desert, Namibia. We show that, in a highly seasonal