Abstract Social monogamy with bi-parental care is the most common breeding pattern in birds. yet cooperation between mates has not been intensively studied to date. In this study we investigate synchronisation of parental behaviours in the blackcap Sylvia atricapilla. a species characterized by bi-parental care and high nest predation. https://www.roneverhart.com/10mm-Male-GRAV-Angled-Quartz-Banger-45/