Shiny Cowbird (Molothrus bonariensis) Science Article 5
The Rufous-collared Sparrow or Chingolo (Zonotrichia cupensis) is one of the main hosts of the Shiny Cowbird (Molothrus bonariensis) through most of their overlapping range in South America. The most recent study on the interaction between these species was carried out by King (1973) in Horco Molle, province of Tucuman, northwestern Argentina. In 1970 I began to collect data on all the nests of Rufous-collared Sparrows which I found in my study area near Lobos, province of Buenos Aires, Argentina. Rufous-collared Sparrows are quite abundant here and I have found 45 nests.
ROSENDO M. FRAGA, Wilson Bull., 90(2), 1978, pp. 271-284