Aves 4 Egg rejection Evolutionary equilibrium 4 Host defence 4 Mimus saturninus 4 Molothrus 4 Molothrus bonariensis 4 Monte Carlo analysis 4 Risk dilution 4 brood parasitism 4 clutch size 4 defense behavior 4 egg rejection 4 numerical model 4 parent-offspring interaction 4 passerine 4 rearing 4 reproductive cost survivorship 4