So our design goes one house, a small run(with a solid roof and a mesh bottom), and house, and then the small run has an extension of a bigger run which we can close the chicks off to. So my question is does the big run(it has a mesh top) have to have a mesh bottom also? They would just be out there in the day on days we are home and they are near our wooden fence close to our house in compacted dirt. We have tried moving the dirt away and under it are big old rocks. We just moved to this house so I am unaware if we get snakes down there, but we do get coyotes(we have seen three in the back/front yard) Thanks for any help!