Further Evidence of Breeding by Shiny Cowbirds in North America

Matthew J. Reetz; Jacob M. Musser; Andrew W. Kratter

doi:10.1676/09-124.1

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Matthew J. Reetz,^*,**,*** Jacob M. Musser,^**** Andrew W. Kratter^*****

^*Corresponding author; e-mail: mreetz@wisc.edu
^**Department of Wildlife Ecology and Conservation, University of Florida, P. O. Box 110430, Gainesville, FL 32611, USA.
^***Current address: Department of Forest and Wildlife Ecology, University of Wisconsin, 1630 Linden Drive, A230A Russell Laboratories, Madison, WI 53706, USA.
^****Department of Ecology, Evolution, and Behavior, University of Minnesota, 100 Ecology, 1987 Upper Buford Circle, St. Paul, MN 55108, USA.
^*****Florida Museum of Natural History, Box 117800, University of Florida, Gainesville, FL 32611, USA.

Abstract

We report evidence of egg-laying in northern Florida by the Shiny Cowbird (Molothrus bonariensis). Examination of the ovary and oviduct of a female trapped in Alachua County, Florida in late June 2006 revealed ovulation and recent passing of eggs. Two other Shiny Cowbird females captured in late May and early June had convoluted oviducts but showed no other signs of recent egg-laying. These three specimens add to the few female Shiny Cowbirds captured in North America. Our observations represent further evidence that Shiny Cowbirds likely breed in North America and additional evidence of breeding outside of southern Florida.

Citation Download Citation

Matthew J. Reetz, Jacob M. Musser, and Andrew W. Kratter "Further Evidence of Breeding by Shiny Cowbirds in North America," The Wilson Journal of Ornithology 122(2), 365-369, (1 June 2010). https://doi.org/10.1676/09-124.1

Received: 10 August 2009; Accepted: 1 December 2009; Published: 1 June 2010

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