I have 3 indian runner ducks in a large pen in my back garden. We live in a row of 4 cottages where only our cottage on the end and the one the other end have a back garden. There are 2 or 3 gardens that back directly onto ours.
This morning when I fed our ducks I noticed some orange pepper in their pen. I didn't feed this and know they don't like it. There was also a lot of picked grass and I've noticed that a fair few other times.
Ok, I know so far it sounds petty but, the duck pen is about 3 meters away from the nearest back garden meaning the neighbour feeding them would need to climb over their wall and physically enter our garden. I know some of the families have young kids and if they'd knocked on my door I'd have happily invited them to see the ducks, in fact I caught one to show the 2 year old that lives at the back of us as they can't quite see the ducks due to a very large hedge.
I'd previously thought the ducks were eating less due to the hot weather but now it seems it's that some one else is also feeding them. They've been consistent layers but we recently had a day with no eggs and are getting one less than usual.
If I'm not being unreasonable then how do I put a stop to this? I've now locked the pen but I'm worried about what else they might be feeding them.