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I assume the yard is securely fenced so chicks can't get out? That'd be my main concern. If you have a secure run you could also try giving the chicks the run while the adults are locked out, and do that for a few days, so the chicks will start treating the run as somewhere safe to go. And...

Photos of your set up? When you say "run the yard" is there a secure run or are you free ranging?