What are you feeding them? Having a pot of calcium in there pen can do a surprising amount of goodness for them. For ducks, to give them a bit of a boost we tend to feed them on cooked rice and peas(or corn) for a few days when they get a bit bored.
That's another thing, have they got plenty to do? Giving them a pile of grass to scratch through, or a chunk of stale bread to peck at can occupy them for a while.
That's another thing, have they got plenty to do? Giving them a pile of grass to scratch through, or a chunk of stale bread to peck at can occupy them for a while.