The Birb King
Bird is the word
I will be making an outdoor aviary for my button quail soon. It will be a triangle shape and 5 feet long, 3 feet wide, and 3 feet high. I hope to also add some plants and rocks to make it look nice and natural.
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It really depends on your predators and your ground, etc. lots of factors.
A lot of folks do 18" and it works for them. If you have a coop camera, you should be able to tell a lot about what's going on once you get your chickens in place.
We have pseudo woodland here, with a small stream across the back of the property, and get foxes, racoons, possum, snakes, rats, groundhogs, maybe mink and weasel. Cats for sure, maybe dogs. Loamy clay soil, lots of tree roots. I was surprised by how far away from the coop I've found dig marks. But most of the time it is within the first two feet.