FWIW: Last year I cleaned 45 mice and 47 gophers out of my rural Michigan property with a very simple bucket method. 5 gallon bucket with 3 gallons of water. Pour black oil sunflower seeds on water surface until covered. 3" x 4' wooden ramp (pine, osb, whatever) with two screws through one end to hook over edge of bucket for holding ramp in place. Mice or gophers smell sunflower seed, climb up ramp, see seed heaven inside bucket, jump in and swim ... for a little while.
The nice thing about this method is you can catch several mice or gophers in one setting and you don't have to handle the critters. Just remove the bucket and dump it away from where you are catching and predators / birds will make short work of the rodents.
I have tried many other methods. I have a bucket with a paint roller mounted inside and ramps that go up to the roller. Peanut butter on the roller around the center and mice climb up and their own weight spins them off. I still catch more with the simple seed bucket.
This picture is from one evening, helping a neighbor out. Like I said, 47 gophers last year on my property and I've had only one this year and got him within an hour of seeing him on the lawn.
