I have two ponds. My first pond has an island. My thought was that it would be used by the ducks so they could lay their eggs and be safe. That never happened. They will occassionaly climb on it and sit, but most of the time, they are either on the edge of the pond, out in the open, or under some trees in another favorite spot. When I built my bigger pond, I decided not to put an island in it. That bigger pond gets all the wild ducks, and they seem to spend their time out in the open water. I have no idea where they sleep, or nest, but don't regret not having an island for them. Eventually when I fence in my land and I can keep coyotes out, I might add some domestic ducks to that pond, or not. They are fun to see, so I'm still unsure what I'll do.