Agelaioides badius Molothrus rufoaxillaris 12 Brood parasitism 10 Molothrus 10 Molothrus bonariensis 8 Aves 6 Bay-winged Cowbird 4 Screaming Cowbird 4 brood parasitism 4 cooperative breeding 4 passerine 4 Breeding success 2 Brown-and-yellow Marshbird 2 Coevolution 2 Cooperative breeding 2 Egg laying 2 Host specialization 2 MARK 2 Mimicry 2 Nest provisioning 2 Nest survival 2 Pseudoleistes virescens 2 Screaming cowbird 2 Shiny Cowbird 2 Turdus merula 2 avifauna 2 brood size 2 conspecific 2 egg 2 extrapair mating 2