Their natural environment would be to roost in trees at night but we have no idea how many get picked off in "their natural ways" My Muscovy's use to have to be walked into their coop every night till they finally got into a routine. Now the older ones teach the younger {Mamas-Ducklings] to go in every evening before dark mine love their houses. Do you have quite a few drakes? that can make it hard to get them all in because drakes will fight in enclosed situation when I had more than one Muscovy drake the boys had their own bedroom[stall] inside the duck house so they were separated from each other. Your taking a big chance leaving your ducks out so late and after dark. I'd start getting them use to being herded inside before dark.No I wouldn't,. But I would rough it out and make do for the greater good. If I can get them to hatch,. Chances are I will have plentiful eggs come next summer. If I wait till spring,. It will more likely be a year till I'm getting more steady egg flow. Plus allowing the ducks to live out their natural ways and mother some ducklings may just get them to be more comfortable in their new environment here
Oh and I think because of the warmer weather we're having this fall I still have 1 scovy female laying and she wants to brood, no way this late in the year. They have been later to molt too.