Prediction: The population of medium-sized crickets will likely decrease over time.
Reason 1: Medium-sized crickets are more vulnerable to predation compared to both small crickets, which can hide easily, and large crickets, which are too big for the bird to consume.
Reason 2: As the bird continues to feed on the medium-sized crickets, their population will be continually reduced, leading to a decreased reproductive rate and potentially causing a decline in their numbers over time.