This would be essential to our proposed 'duck conversion'. We are crawling with just about every kind of predator here (that inlandd MA can offer, anyway). If we had a flock of ducks that couldn't be LOCKED into coop at night, that would be a real problem. They would truly be...........sitting--then DEAD--ducks! Again, we want Khakis at least for now. They will be in a (possibly divided) 1296 sq. ft. run (36 x 36). If we had to chase them into coops at night, that would be an irritating, but maybe acceptable alternative to having them go in on their own. Nice thing about our chickens, and prob. yours too, is that they go into the coop at night on their own. So, will ducks do this?