Your brown ducks that many have called Campbells, look more like Bali or Indian Runners. These birds were all descended from your part of the world and these look similar to the ones I've seen in pictures. They appear to be Fawn colored, but what a birds looks like in the US and what a bird looks in Singapore are two totally different things. At any rate they are beautiful! Even the Muscovy look interesting and I don't like that breed whatsoever.
Jason
Jason