Marilyn only caught the tail end of the radio spot, and didn't get
the names of any experts. But here's an article that discusses the
origins of brood parasitism:
http://beheco.oxfordjournals.org/content/17/2/196.full.pdf
For each of a number of avian lineages in which obligate interspecies
brood parasitism has independently evolved, the authors examined the
probability that it evolved directly from the normal breeding mode
(through such routes as the takeover or use of nests built by other
species, or communal laying by cooperative species), versus
indirectly by way of transitional intraspecies nest parasitism.
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