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Gwar [14]
3 years ago
14

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 ________.
Biology
1 answer:
makvit [3.9K]3 years ago
4 0

Answer:

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

Explanation:

  • An innate behavior which specific to a species and is highly stereotyped is termed as a fixed action pattern.
  • This behavior occurs due to a neuronal network that is hard-wired in the species and the response is said to be generated following a key stimulus.
  • A key stimulus is the one that generates a fixed action pattern and this is also called a releaser.
  • A key stimulus can be in the form of shape, sound, color, or a combination of these.
  • In this case, the red spot is a stimulus for the chicks which causes them to peck at their parent's bill, and hence, the red spot is a key stimulus, and pecking of the chicks is a fixed action pattern.
  • The parents regurgitate the food only when the chicks peck at their bills, so pecking is a key stimulus for the parents which causes them to regurgitate the food which is a fixed action pattern.
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