Ducks can be a great addition to your pond! If you're worried about predators, the mobile coop idea could work, but you’ll need to train them to come back at night, which might take some time. As for breeds, it really depends on what you want. If you’re after something hardy and easygoing, maybe look into breeds like Khaki Campbell or Pekin. They’re also pretty good for eggs if that’s something you’re into. Just make sure your pond is safe for them, and you’ve got some shelter from predators!