Prediction | IBP Hypothesis (a) | CBP Hypothesis (b) |
---|---|---|
1 Recognition | CBP eggs < IBP eggs | CBP eggs ≤ IBP eggs |
2 General ejection rate | CBP eggs < IBP eggs | CBP eggs ≤ IBP eggs |
3 Ejection and risk of parasitism | Higher under IBP risk | Higher under CBP risk |
4 Aggression | Blackbird < Cuckoo | Blackbird > Cuckoo |