I have 21 ducks total. 10 rouen (4 months old) and 11 pekin (6 weeks old). They've completely integrated and have no issues with each other. I've read multiple threads, blogs, posts, etc,.. about ducks not liking to go into their houses but that isn't the issue in my case. All of them go into the house during the day and only come out if I go into the pen and interact with them or to eat/drink. During the night, they stay outside and sleep on the ground. Is this normal behavior? I've tried light/no light, heat/no heat, moving the food and water in and out of the house but nothing changes their routine. My concern is that once they start laying eggs they'll lay eggs outside on the ground rather than inside the house in their nesting boxes. Thoughts, comments, and advice are welcome!