Ok So i rescued my duck(Waffles) when he was an egg and his mother was dead. He was the only one of seven that hatched. We got him a Chicken and they are best friends. He is about 51 days old now. When can i be sure whether or not waffles is male or female. We think male but he has the coloring of female though his head is getting green. We call waffles a he, and we know the chicken (Moe) Is female.