Probably not. They don’t build nests. They deposit their eggs in the nests of other wild bird species for the host species to raise their young.
Don’t the hosts know they have a “foreign” egg or nestling? Evidence suggests they do. Some species will dispose of the cowbird egg, others incubate, hatch and rear the cowbirds along with their own. Evidence also exists that cowbirds watch over their eggs and may retaliate if the host birds don’t accept them.
So, what did I find on my Eastern Bluebird monitor route walk today? Something I’ve never found before. Two Brown Headed Cowbird eggs in a nest with 3 lovely bluebird eggs. The adult bluebird pair was in the area perched above its nest-box guarding it as usual. In spite of the cost to their own young (they will have a difficult time finding enough food to feed the additional mouths with very large appetites) they will likely be good parents to the cowbird nestlings left in their care.