I keep hearing how great ducks are for slug and snail control (which we desperately need), but live in the city with close neighbors. Would a pair of indian runners work in a well fenced backyard? Is there a better duck breed for a small lot (3000 sq ft)? Also, what is their noise level? We keep 3 hens for eggs already and have no noise issues with neighbors. Is a male and female the best combination or 2 females? Can I keep a single one with the chickens? Any advice would be welcomed!