Since cowbirds -- ruthless parasites that they are -- are totally dependent upon other birds, seems to me you'd pretty much have to get rid of all the birds to get rid of the cowbirds.
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I've also read that they monitor the nests where they've deposited their eggs, making sure their eggs haven't been discarded by the hosts.. If their eggs are discarded, they destroy the nest and prevent the host birds from rebuilding.
In other words...you're gonna raise my babies or I...