The red spot on the beak of a herring gull parent is a sign stimulus received by baby gulls.

Name: The red spot on the beak of a herring gull parent is a sign stimulus received by baby gulls.
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The red spot on the beak of a herring gull parent acts as a sign stimulus for baby gulls, triggering them to peck at the spot, which in turn stimulates the parent to regurgitate food for the chicks.

The Red Spot on the Beak of a Herring Gull