Aves 473 Argentina 198 bird 115 passerine 111 South America 74 Molothrus bonariensis 62 Animals 59 brood parasitism 55 Molothrus 52 Birds 48 Mammalia 43 Brood parasitism 42 animal 42 nonhuman 42 article 40 AVES MARINAS 38 Passeriformes 36 survival 34 Mimus saturninus 33 Hexapoda 30 SEABIRDS 30 Vertebrata 30 abundance 30 physiology 30 Animalia 28 Hirundinidae 27 AVES 26 Neotropical Region 26 Pampas 26 female 26