So I just signed up to Backyard Chickens. My name is David and I have always liked reading the articles and reviews and they have helped me in my little farm life. I have about 50 hens, 3 roosters, 2 young geese, 4 duck hens, 1 Cayuga drake, a couple guinea, 2 rabbits, 9 Cornish x (35 days old) and a few pot belly pigs. Some are pets of my wife and the other are for food. So I have some new Cayuga duck hatchlings. I noticed 1 was born with an extra ball of fur on their head, but just wrote it off that it would grow out or something. So these babies are a couple of weeks old and the ball of fur is not going away. I have not been able to find any articles of what this is or does this mean this not a pure breed duck. So I have some more that hatched this past weekend and it appears I have another Cayuga baby that will have a ball of fur on his head. Does any one have any ideas if this is common among Cayuga ducks?