First Record of Brown-headed Cowbird Egg in a Lesser Scaup Nest

On 16 June 1999, I found a Lesser Scaup (Aythya affinis) nest parasitized by a Brown-headed Cowbird (Molothrus ater). On 22 June the female scaup had begun incubating the 10 scaup eggs but the cowbird egg was missing, presumably ejected by the female scaup.

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Bibliographic Details
Published in:The Wilson bulletin (Wilson Ornithological Society) 2000-12, Vol.112 (4), p.554-554
Main Author: Koons, David N
Format: Article
Language:English
Subjects:
Analysis
Animal ethology
Aves
Aythya affinis
Biological and medical sciences
Bird nesting
Birds
Brood parasitism
Cowbirds
Egg (Biology)
Eggs
Eggs and nests
females
Fundamental and applied biological sciences. Psychology
Molothrus ater
nests
Ornithological research
Psychology. Psychoanalysis. Psychiatry
SHORT COMMUNICATIONS
Vegetation
Vertebrata
Waterfowl
Wetlands
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Description
Summary:On 16 June 1999, I found a Lesser Scaup (Aythya affinis) nest parasitized by a Brown-headed Cowbird (Molothrus ater). On 22 June the female scaup had begun incubating the 10 scaup eggs but the cowbird egg was missing, presumably ejected by the female scaup.
ISSN:0043-5643
2162-5204
DOI:10.1676/0043-5643(2000)112[0554:FROBHC]2.0.CO;2