I saw a fox under the Champlain Bridge this week.
This was a Red Fox, which is unusual where I live. Most of the foxes in the Adirondack High Peaks are Gray Foxes, which seem to crowd out the Red in wooded places. Gray Foxes can climb trees! Their claws are partially retracting, like cat claws. They tend to be mostly red, the name notwithstanding.
The easiest way to tell the two apart is by the white tip on the tail of the Red. The Red Fox can be all red and white, red with gray, or all gray.