12-15 years ago, around the middle of February, I was near Kenyon hunting coyote and Fox. I was watching 4 coyote during the day, 3 were trying to work out who was going to breed the one female. This was right next to a high use snowmobile trail. The section was low cutting through a drained bottom, in places there was barnyard weeds standing near the trail. Several sleds came along while I was trying to figure out how to get within range. The coyote moved over and layed down at the outside edge of a weed patch, letting the snowmobiles cruise by. I was excited thinking I still had a chance. But as soon as the sleds crossed the section road the female was up and running to a large stand of trees about a mile and half away. That is as calm of reaction I have seen to snowmobiles. Road graders blading gravel roads will often cause coyote and Fox to move. At night the reaction to vehicles is usually the sit and watch,as long as the vehicle continues to move without slowing. When the sound of the vehicle is gone ,I see them get up and continue on their travel. In the winter the sound of gravel off the tires really travels a long ways.