A solitary breeding pair of Australian Eurasian Coots Fulica atra australis on a small wetland in Sydney, New South Wales, was monitored during the 2015–2016 breeding season. Three breeding attempts were observed, during which two nest-platforms were built. Adults incubated eggs for 20–35 minutes at a time. Our monitoring recorded two observations of copulation and 58 observations of aggression towards a conspecific or other waterbird species. Aggression events most frequently involved lone or multiple Dusky Moorhens Gallinula tenebrosa . Of five chicks recorded in one breeding attempt, only one survived >5 months.