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They must have innate vocalizations, because male cowbirds have a unique 
and distinction vocalization, as do females. They do not imitate their 
foster parent's song.

At 03:19 PM 5/20/2008 -0500, Gail Ahumada wrote:
>Just returned from a vacation on St. Croix (a first), and, while watching
>frigatebirds, bananaquits, pearl-eyed thrashers, etc., was asked by a new
>acquaintance about bird song.  She said, "When a parasitic bird, like a
>cowbird, lays its eggs in the nest of another species, what songs do the
>baby cowbirds sing; and how do they learn their songs?"  That is, do they
>sing some innate cowbird chatter, or the songs of their foster parents,
>or what?
>
>And I said, "I have no idea!.  But I bet I know some folks I can ask."
>
>So I'm asking.
>
>Gail Ahumada
>St. Louis  MO
>
>------------------------------------------------------------
>The Audubon Society of Missouri's Wild Bird Discussion Forum
>List archives: https://po.missouri.edu/archives/mobirds-l.html

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The Audubon Society of Missouri's Wild Bird Discussion Forum
List archives: https://po.missouri.edu/archives/mobirds-l.html