I made a super cool gravity feeder for my chickens that hold 2+ weeks worth of food. Everything about it works great except.... They have figured out how to shove their heads in there and toss tons of food out. They've gone through at least a weeks worth of food in the last two days and its now in a pile on the feed board. I've covered up the troughs with duct tape as a temporary fix to force them to eat whats on the ground but I'm wondering if anyone has any suggestions to prevent this in the future. I didn't have any trouble with this with their baby size gravity feeder so it's super frustrating!
Here are some pics so you can get an idea of what I'm working with:
Here are some pics so you can get an idea of what I'm working with:

