Amblyramphus holosericeus Molothrus bonariensis 4 Nest predation 4 Nesting behavior 4 Nesting success 4 Pseudoleistes virescens 4 Scarlet-headed blackbird 4 Territoriality 4 passerine 4 Agelaius thilius 2 Gallus gallus 2 Molothrus rufoaxillaris 2 Passeriformes 2 Turdus merula 2 brood parasitism 2 defense mechanism 2 nest guarding 2 nest predation 2 parasitism 2 reproductive success 2