I am replying to add tracks and tracking to this post, but you guys beat me too it.
Tracks and Droppings go together when scouting, for the most part.
UB, finding fresh tracks in a muddy trail or on a tractor path after a rainfall or fresh snow will give you a time line when the critter came though. Years back, I used a trail timer(before trail cams). That's was the modern day thing to use for Deer, but I used it on Fox & Coon...
Scouting is ongoing when it comes to furbearers, don't stop looking because you are out there doing something else in the middle of the summer. Keep close to critters. And in-season scouting is a must as the furbearers are changing gears from time to time.
Grey Fox droppings are the same size as Red Fox, but blunt ends. Red Fox & Coyote droppings have tapered ends.
Tracks-
I view a single track or dropping as just that. A Fox or Coyote passed through.
Tracks I look for are coming and going from 2 different directions. That's a good trail.
Better yet to find a 4-way crossing, coming and going in 4 different directions...Bingo! That's where McDonalds wants to sell burgers. That's the area to work over.
Look to see if the tracks are different sizes, meaning you have a family group or two to work over. This will help you estimate how many critters are using these trails. And this information may help determine how many critters you want to remove from this area and how much time or set ups you want to plan for this area.