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I believe those are horse panels. 2x4 openings and 5 ft tallThe panels in the pic aren't what we know as cattle panels here. The pen you posted has smaller openings than cattle panels. Really interesting though.
I am in suburbia so no coyotes, rats or possums. We have lots of fox, hawks and raccoons though.
I am not much help I guess.
I would keep looking for "rabbit wire" "cage wire" or hardware cloth on sale.