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Table 1 Summary of predictions derived from IBP and CBP hypotheses. ≤ means a similar or lightly smaller rate

From: Egg rejection in blackbirds Turdus merula: a by-product of conspecific parasitism or successful resistance against interspecific brood parasites?

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