Many species of gulls feed their chicks by regurgitating food. When parents return from foraging, the gull chicks peck at a red spot on the parent's bill, which causes the parents to open the bill and regurgitate their food

Chicks will peck at a red dot painted on any long,
slender object. For the chicks, pecking is a
____ and the red dot is a ____ . For the adult gulls, the chicks pecking at their bills is a ____
and regurgitating food is a ____ .
Fill in the blank with the appropriate word.


fixed action pattern, key stimulus, key stimulus, fixed action pattern

Biology & Microbiology

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