What type of behavior are the gulls demonstrating when they remove the eggshell fragments?

The gulls are demonstrating a behavior known as "egg shell removal" or "shell disposal." This behavior is typically a form of parental care, where adult gulls remove eggshell fragments from the nest after their chicks hatch. By doing so, they help reduce the risk of predation and maintain a clean nesting environment, which can also prevent the attraction of predators to the area. Overall, this behavior enhances the survival chances of the chicks.