Abstract
THROUGH the courtesy of Dr. Herbert Friedmann and officials of the Washington Zoological Society, a number of South American icterids were consigned to me for study in November, 1962. Before being shipped to Austin, Texas, the birds had been held in aviaries or cages in Washington, D. C., for an unspecified period, and some or all had been used in research conducted by Dr. Friedmann. Included in the shipment were a male Baywinged Cowbird (Molothrus badius), two males and a female of the Shiny Cowbird (Molothrus bonariensis), and three male Chestnut-fronted Troupials (Agelaius rujicapillus). In Austin the individuals of M. bonariensis were housed in a large cage with two female Brown-headed Cowbirds (Molothrus ater), and the male M. badius was placed in an adjacent cage with the three individuals of A. rujicapillus. Notes on behavior reported in this paper were made in the course of approximately 16 hours of observation in December, 1962, and January, 1963. This research was supported by the National Science Foundation (Grant 20873).
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