Good morning, Congrats on having a duck nest in your yard! My suggestion is to just leave the nest alone. The duck has picked a spot that she's comfortable with and putting up a fence will just draw attention to the nest. And it won't keep wildlife out. If a raccoon finds the nest and wants the eggs, a fence is unlikely to deter it for long. She and the eggs just have to take their chances. That's the way of the wild. If the neighborhood kids show interest in the nest it would be a great opportunity to teach them about wildlife. Given the unusual spot she picked for her nest site, I would guess that you have a mallard nest. They lay 8 to 12 eggs. The hen will incubate the eggs for 23 to 29 days. Once all the eggs hatch the ducklings will be ready to go. It's likely that she'll take them to the pond you mentioned. The duck (and her nest and eggs) are protected by federal and state laws. So disturbing them is illegal. If you have more questions please feel free to e-mail me. Good luck ducks!