When birds chicks open their mouths the mother bird immediately finds food and feeds them the baby chicks response is an example of?

The baby chicks' response of opening their mouths when they sense their mother nearby is an example of a fixed action pattern, which is a type of instinctive behavior. This behavior is crucial for their survival, as it triggers the mother's feeding response and ensures that the chicks receive nourishment. Additionally, this behavior can be classified as a form of innate behavior, as it is hardwired and does not require learning.