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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