We've had ducks and they're really nice and fun birds, HOWEVER, they will swim in every stock tank that they can get to, and when they swim, they poop. Their water has to be changed once or twice per day, and you have to find a way to keep them out of your other livestock's water. They're a lot of trouble, but they're worth it. They're also great at controlling snails. We always allow them access to our pastures to cut down on snails and help prevent liver flukes. This year we're thinking of putting fences around our garden and introducing some ducks to control snails and slugs.