Repressed ducks?

[LLCoyote]

I'm trying to make my ducks go out and roam our three acers durring the day. There are no predetors out at this time and I am always close by to watch them. The problem is I have to force them to get out of their pen. As soon as I go inside or take my eyes off them they can be found sitting in front of their pen or inside of it. How do I get them to want to be outside? It's a hassle to constantly prod them to go outside. Doesn't everything need sunlight? Ever since I moved their pool (Their outside enclosed pen is flooded because of how I empty the pool by dumping it and I don't want them in there) they refuse to get in their pool. I'm worried...