I think the big thing is water, and it really depends then on where you live. I change my water buckets a couple times a day. If they are out in the yard in their tractor, they will dig holes with their beaks all around the bucket and turn the water to mud within an hour. It's hard on the yard that way, so unless you have a huge space, consider that. My ducks have a little pond in their enclosed run and I drain and refill that every day because they swim in it all the time and it gets dirty fast. I don't think it's really fair to ducks to not allow them something for swimming. That's how they keep clean and it's what they love the most. My ducks are clean because they have access to swimming, but they love playing in mud and making mud because they're going for whatever bugs are under the grass. As long as you can protect them and understand the challenges the water brings and can provide them with clean water, you're good to go. I did read initially that they were hardier and more healthy than chickens, when I was deciding between ducks and chickens, but I have had plenty of medical issues, and you always need to be checking their feet for bumblefoot. But if you have the time and energy to provide a happy life for them, they are wonderful! I love my ducks so much!