My coop and run are one combined unit, at first I thought maybe there were mice, rats, squirrels etc doing this because I found some small animal droppings in the coop so I finished closing off all the vents up by the roof that they may have been able to get in and out through with hardware cloth. Since then I haven't found small droppings but the food continues to be brought into the nest box! It's making the bedding in the box really nasty, dirtying up the eggs, causing insect activity inside the box, and bothering me.
Does anyone have any idea why this may be happening? The compost pile is decent sized for four chickens to eat off of, and on top of they they also have a feeder with pellets in it. I don't know how to catch or stop this behavior, or maybe if it's something that one of my non-layers is doing, if they will grow out of it once they start laying?