Molothrus bonariensis 24 Shiny Cowbird Brood parasitism 20 Molothrus 18 Aves 6 Creamy-bellied Thrush 6 Pseudoleistes virescens 6 Turdidae 6 Turdus amaurochalinus 6 brood parasitism 6 Agelaius thilius 4 Antiparasite defenses 4 Brown-and-yellow Marshbird 4 Chalk-browed Mockingbird 4 Egg punctures 4 Mimus saturninus 4 Molothrus rufoaxillaris 4 Screaming Cowbird 4 Yellow-winged Blackbird 4 Agelaioides badius 2 Agelaius 2 Animals 2 Antiparasitic defenses 2 Breeding success 2 Brood reduction 2 Brown-and-Yellow Marshbird 2 Coevolution 2 Colonial nesting 2 Costs of parasitism 2 Cues 2