Hi Folks: I'm just building my coop and yard. Planning a 7', 1/2' hardware mesh fence + net top - the tied black string kind - work against predators? We have racoons, fox, possums, dogs, hawks, etc. Thinking I also need electric. What say? Planning to shut the birds in at night (after teaching them to go into an automatic door). Any training tips? New to chicken ownership - as a child had a nice chicken house + very strong and effective fence, but no top to the fence. Put the chickens in at night.