Indigobird Indigobirds are subtle in their tactics. The female parasitizes only nests of the species that raised her, and she will only mate with males that have also been raised by this species. (She can tell because he's learned the song of their shared host parents.) The female's choice means that the resulting young will inherit qualities that match those of the host species, since both its mother and father were accepted into host broods. The nestling is born ready to blend right in with the host young. Caption: The male indigobird learns the song of his host parents.