Excellent video put up by Jed Jackson 

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I don't know if they burrow, but they are everywhere here. Small as 8 inches and thin enough to get through most standard wire.Hello and welcome to BYC!Glad you joined.
I have a predator apron around my entire coop/run setup. But I'm not trying to keep out black snakes. Do you know if they burrow?
I'm assuming you have black rat snakes. Apparently no snake can burrow. I just looked that up. But black rat snakes are exceptional climbers so you'd have to have a tightly covered run to keep them out.I don't know if they burrow, but they are everywhere here. Small as 8 inches and thin enough to get through most standard wire.