You dig a hole under a tunnel and use birdseed as bait? Is this the method you used?
I don't have small children around so I can do this, a five gallon pail above ground with a means for the rodent to climb up and jump in. Suicide really. Some seed is inside as an attractant. I have a rock wall I put the bucket next to. 4-5 inches of water maybe safe around children unless it rains.