Different experiments of simulated predators (flights of a raptor model, playbacks of raptor whistles and of alarms by conspecifics) were carried out on groups of captive Grey partridges (Perdix perdix) from game-farm stock, either intensively- or parent-reared. Both flights and alarms elicited high levels of antipredator behaviour. Freezing and vigilance occurred significantly more in parentthan in intensively-reared coveys. Upright vigilant posture was performed significantly more by males than by females. Good sentinels, i.e. the more vigilant males, formed a stable pair bond earlier than the other males. Advanced reproductive timing might compensate for the increased risk of predation from a sustained vigilance.