IM raising Mallard duckling and one of them is bigger than the others it has a white ring around it neck?

Question

the duck has a raspy voice and a yelllow beak i think it a male but im not sure people say it a not a mallard but it look excatly like the other duck expect for the ring and it cant fly yet but it trying to

Answer 1

Its a male they have a white ring around there necks.