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Digging down isn't full proof either. Dh had used small field fencing burried it what we thought was good enough. With our sandy soil it had already begun to get dug under. Had a coon (I think) kill 3 guineas & tear one up Saturday night. Sunday we dug WAY down & burried some leftover used sheet metal about 18inches deep. Did the guinea & peafowl cage already so we have 2 more permeant pens we plan on doing today & maybe tomorrow. Rolled out of bed today & found lots of sore muscles!!!! Both of those pens are 28x28 so that was enough digging & dirt pushkg for one day!
I do use chicken wire with my movable pens & have never had a loss, but honestly any critter could easily get in those since our soil is effortless to dig up. I have 4 empty cattle pannel style pens right now & I will only use them for quarentin or breeder pens. I love the idea of birds always being on fresh ground, but movable pens are not safe enough where I am at.
I have personally torn chicken wire with my own hands& wouldn't consider myself super woman. I would use hardware cloth-- the birds won't stick there heads through it & little birds can't escape it.
If you will build the movable pen so that a cattle panel can be attached to the bottom of the pen. Use a panel with smaller openings. So long as the bottom is the width of the panel and length is no more than the panel that would work well.
Option 2 place some 18 inch 1x1 or 1/2 x 1 welded wire around the edges of teh pen like an apron, the varmits will not be able to get close enough to easily dig in.
The big thing that ussually causes the varmits to dig in is eggs left in the pen or a bird that does not like to roost as they will find a corner and tuck in tight. This is very common with young birds even if they roosted before in another coop they may not roost in the new coop until they are more comfortable with the other birds and teh roost pole.