Strange Tracks at "Trid"

Last January 7, 2011, some snow was on the ground and out in the back yard, I observed this strange tunnel like track in the grass.  The snow and grass had been smashed down and that left it looking like a big snake had gone through there but, no snake would be gliding through the yard as cold as it was last January 7th, so I do not know what kind of tracks this was.
Now, here we are, spring of 2011, and that large, long track is still there in the grass, it is really all smashed down and is very visible as you can see from the pictures.