parental care Aves 16 Molothrus bonariensis 14 brood parasitism 14 passerine 12 Molothrus 10 Brood parasitism 8 Molothrus rufoaxillaris 8 nestling 8 songbird 8 Mimus saturninus 6 clutch size 6 nest predation 6 Animals 4 Argentina 4 Life-history traits 4 Parental care 4 Parental investment 4 Shiny cowbird 4 Troglodytes 4 Troglodytes aedon 4 Troglodytinae 4 adaptation 4 animal 4 behavioral response 4 bird 4 feeding behavior 4 fitness 4 generalist 4 parental investment 4