Good little ducky's!

I have 6 Peking's and they are free ranging my yard ( 8 acres) they keep close to the house for the most part unless were out walking the yard then they follow us. yesterday I was doing chores and working on the goose pen when they came walking up about 8:00pm. they wanted to go in the barn but their pen wasn't ready. I quick hurried up and drug it in the barn(its portable for cleaning) and put fresh bedding in it and set the water can. then I went to fill the feeder and they had left the barn and were now on the other side of the house. I figured I would round them up in a while. went back to what I was doing and needed something out of the barn, when I walked in they had all piled into the pen and had settled down for the night on their own without lifting a finger. I guess you can train them to some extent? they know when its late to come to the barn. didn't figure on them going to bed on their own.