Janet,

"The Birder's Handbook", by Paul Ehrlich, David S. Dobkin and Darryl
Wheye (Jun 15, 1988) has a few excellent essays on hybridization.
Cornell University has several more technical publications
(ornithology) that are also superb.  I refer to the Erlich, et. al.
book often.

Frank

**********************
Frank Boyle
Rohrersville, MD
**********************

On Mon, Jun 6, 2011 at 9:15 PM, Janet Millenson <> wrote:
> A non-birding friend called to ask me about bird hybridization, especially
> what causes it to occur in the wild. Some of you folks undoubtedly know a
> lot about hybrids -- can you recommend any books or articles on the topic?
> Also, how much hybridization was observed by Atlas data collectors?
>
> Thanks for any information.
>
>
> Janet Millenson
> Potomac, MD (Montgomery County)
> 
> ----------------------------------------------------------------
> "Look at the birds!" -- Pascal the parrot
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