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The current issue of Science News (May 30th issue) has a nice
little article on cowbirds.

The article states that such parasitism has only evolved in about
seven instances. (Although the article didn't specifically say so, 
this would have to refer to extant species as there's no way to 
really infer this from the fossil record.) The implication seems
to imply that it is a rare strategy.

If such a thought is extended to dinosaurs, it would imply such
parasitism would be rare there too.