That explains the color. I was wondering about that.
I use water and just dump the dead mice in the run. The chickens have a lot of fun playing keep-away and they get the free protein. You can't do that with antifreeze.
This is what I do but I like yours better. I have to reset mine.
Just a note. You see the water in the bottom of Trevmillion's trap. Mice can jump really well. They probably can't jump out of a five gallon bucket but they could a shorter one. Water in the bottom keeps them from being...