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1 June 2005 First Record of Bronzed Cowbird Parasitism on the Great-tailed Grackle
Brian D. Peer, Stephen I. Rothstein, James W. Rivers
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Abstract

We report the first record of Bronzed Cowbird (Molothrus aeneus) parasitism on the Great-tailed Grackle (Quiscalus mexicanus), which represents the 96th known host for this cowbird species. The record is based on a parasitized clutch, collected from Sinaloa, Mexico, in the collection at the Western Foundation of Vertebrate Zoology. The clutch contained four grackle eggs and one Bronzed Cowbird egg. This record is unusual because the Great-tailed Grackle is extremely intolerant of foreign eggs, ejecting them from their nests almost immediately. As the Bronzed Cowbird expands its range and is studied in greater depth, more hosts will undoubtedly be recorded.

Brian D. Peer, Stephen I. Rothstein, and James W. Rivers "First Record of Bronzed Cowbird Parasitism on the Great-tailed Grackle," The Wilson Bulletin 117(2), 194-196, (1 June 2005). https://doi.org/10.1676/04-077
Received: 22 July 2004; Accepted: 1 March 2005; Published: 1 June 2005
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