Why does a herring gull chick’s food-begging behaviour change as it grows older?

In the context of animal behaviour, a herring gull chick’s food-begging behaviour undergoes a significant shift as it develops to enhance its survival and reduce the risk of predation.1

When chicks first hatch, they possess an innate ability to stretch their heads and gape for food in response to any mechanical disturbance, such as a parent landing on the nest. This generalized response is an early survival mechanism.1

As the chicks develop, this behaviour becomes more refined: they begin to stretch and gape only when their parents appear. This change is an adaptive, antipredatory measure, as it would be dangerous for nestlings to vocalize or gape in response to any environmental disturbance, which could inadvertently attract predators to the nest. Later, as the chicks approach adult size and shape, they may beg for food using head-tossing and high-pitched calls, though they are eventually ignored or rejected by their parents as they reach independence.12