Our ducks are allowed to free range the yard and creek. We built them a new winter house yesterday and spent $300 on a dog kennel to go around the duck house so they would be safe at night. The only time we've locked them up before was up until they were feathered. Last night we herded them into the kennel. Tonight I couldn't get them out of the creek for love nor money. I left the light on in their house and it's dark everywhere else, but they still won't go in. How do I retain them to go into the pen at night? I left their food out all day yesterday so they could eat whenever they wanted. Should I start feeding them just twice a day so they are hungry and go in?