I get by with a 6' fence. At 4' wing clipping won't help because they can hop right over the fence without any problem.It didn’t help that when the crew of 9 flew the coop onto the neighbors garbage cans they would come out and feed them. I felt bad which is why I got rid of them. I’m pretty sure them feeding wasn’t helping the problem really friendly birds. Just started looking pretty.
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@R2elk you can see no top bar to the fence it is however only 4’
You are correct that your neighbor feeding them was a big part of the issue.