A friend uses a rat/mice trap that drowns the rodent and no poison is involved. You need a bucket with a snap on lid. She fills a bucket with water. Half of the lid is hinged, creating a “trap door.” Leave a morsel or some bird seed on the hinged part and when he hops up for the snack, he falls into the water and drowns. Safe to use around Mo. She got it at either Home Depot or Lowe’s so maybe your DIY hardware store has one or maybe you could fashion one.