Not trying to be argumentave, but I have always had just 1 inch chicken wire on my pens--have had chickens probably a total of 15 years, off and on, in my 35 year marriage, and my parents always had chickens, also, in chicken wire pens. I have never had, or known of a varment getting thru chicken wire, and I feel completely secure using it. We have coons, skunks, possums, cayotes. I do think if you are in bear country, or something like that, you will need a stronger pen. There is quite a difference in price between chicken wire and welded wire. On the 2 X 4 welded wire, I wonder if a smaller skunk couldn't squeeze thru that? As well as weasels (sp?) and other smaller predators, that we don't have in this area?