Coyotes fiercely protect their dens, fighting to the death. I have seen coyotes take on bobcats (well once I saw a coyote pair chase a bobcat out of the area).
Once I was working in the desert, and took a wiz. The next day, I noticed that there were coyote tracks around where I had gone and it was still wet. Betting that a coyote had marked his territory over me, I made sure I did it again. Next day, same thing so I continued. After about 4 days of this, the coyote simply defecated on the spot, ending the discussion. He won as far as I was concerned.
.....Bob
LOL.