What is the primary trigger for pecking behaviour in young herring gulls?

Question

Quizplus · Accepted Answer

The primary trigger for pecking behavior in young herring gulls is a red spot on the bill of the parent. This was demonstrated in classic experiments by ethologist Nikolaas Tinbergen, who showed that chicks peck more at a model of a parent's bill with a red spot than at other stimuli, indicating that this specific visual cue elicits the feeding response.

What Is the Primary Trigger for Pecking Behaviour in Young