Why might female birds use food-begging displays while courting males?

In the context of avian reproductive behaviour, female birds may use food-begging displays during courtship as a mechanism to reduce hostility from the male.1

Because males are often highly aggressive during the breeding season, close physical proximity can be dangerous for females. By performing displays that resemble the food-begging behaviour typically seen in young birds, the female signals a nonaggressive, friendly relationship, which helps to appease the male and lessen his hostility. Males often respond to these displays by regurgitating food for the female.1

These displays are part of a broader suite of courtship behaviours that facilitate communication and pair bonding while mitigating the risks associated with close bodily contact. In many species, such ritualized interactions help establish a bond between potential partners, ensuring that the pair can successfully cooperate for mating and the subsequent rearing of young.12