This smart mourning dove found a ready-made nest in one of my perennial pots where twigs are plenty. First she laid one egg, and next day another. For the next two weeks she covered her eggs dutifully. No food? No drink? When I was wondering about it, I spotted another look-alike dove came to perch on the rail. He did not make any sound, just waiting and looking. Then he joined the other, and seconds later she flew away. At this point I could not tell which is mother and which is father. Anyway, I have realized that they do take turns to cover their eggs. So I have learned that both female and male birds perform parental duties.