I would set-up a wireless buzzer at the hen house that rings a chime in your house to waken you. Have a yard light shining on the location and have your scoped varmint rifle ready. Hopefully you have an illuminated reticle scope and set-up a shooting table/location.
I have these wireless buzzers on my acreage for security reasons...they are activated when anything walks across their path. Even a Robin will set it off.
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