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EMITTERS AND RECEPTORS
The ethologist, Niko Tinbergen, studied the way adult gulls feed their young. The adult eats its food at sea. When the adult returns to its nest, the chick taps the side of the adult's beak. This tapping action causes the adult gull to open its mouth. The chick then places its head into its parent's mouth and the adult regurgitates some of its food for the chick to eat.
The beak of an adult gull is shown in the image below.
Tinbergen used different models to represent the beak of an adult gull. He showed each one in turn to a young gull chick to see if the tapping reaction occurred. The diagrams below show six of the models which Tinbergen used in his experiment.
The results of this experiment are shown in the table
Answer the following questions
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