Cowbirds are birds belonging to the genus Molothrus in the family Icteridae. They are of New World origin.
The Molothrus genus contains:
- Screaming cowbird, Molothrus rufoaxillaris
- Giant cowbird, Molothrus oryzivorus (formerly in Scaphidura)
- Bronzed cowbird, Molothrus aeneus
- Shiny cowbird, Molothrus bonariensis
- Brown-headed cowbird, Molothrus ater
Cowbirds are brood parasitic. The non-brood parasitic baywing was formerly placed in this genus; it is now classified as Agelaioides badius.
Video Cowbird
Behavior
These birds eat insects, including the large numbers that may be stirred up by cattle. In order for the birds to remain mobile and stay with the herd, they have adapted by laying their eggs in other birds' nests. The cowbird will watch for when its host lays eggs, and when the nest is left unattended, the female will come in and lay its own eggs. The female cowbird may continue to observe the nest after laying eggs. If the cowbird egg is removed, the female cowbird may destroy the host's eggs (see "Mafia hypothesis" for an explanation of this behavior).
Maps Cowbird
References
- Jaramillo and Burke, New World Blackbirds ISBN 0-7136-4333-1
External links
- The White Laboratory of Animal Behavior, University of Pennsylvania
- Icterid (including cowbirds) videos, photos and sounds on the Internet Bird Collection
- Audubon Society: Cowbirds and Conservation
- Juvenile Brown-headed Cowbird with host/parent dark-eyed Junco
Source of article : Wikipedia
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