i just went out and checked my yard
we got about 4 inchs of snow last week after what has been a brown winter. (I still havent had to shovel yet, a first for this minnesnowtan) but yesterday and wednesday there was a big melt. its flurrying again right now.
here is a pic i just took. what you will see is intersecting trails (green arrows) there is a signifcant ice crust on top of the old snow. i brushed off the new flurries and broke through the crust (red oval) to make sure there was a "tunnel". there was. and i know there are mice in the area. seen them many times.
my question for you is how wide is that track? it looks 4 inches wide. my tunnel was about the size of my thumb.