Hard to believe, but coyotes will eat dead coyotes. Protein is protein.
At night, I have had coyotes drag off a dead one, while continuing the stand. Never seen it in the daytime, but I have had them steal foxes, and get away with it.
I have also gone to great lengths to keep vultures and ravens away from a carcass, out of curiosity. Sometimes, you can return months later, and they haven't been touched. I have returned the next day and seen no evidence that it was even there. Other times, I have deliberately left one in the middle of a two track, to save time, intending to retrieve in when I turned around, as on a dead end road to a mine site. At night, no chance that I would not see another vehicle coming up that same road, and a very small chance that there would even BE another vehicle. Guess what? Sometimes they are gone. Birds don't know that trick.
I'm pretty well convinced that a coyote is a cannibal.
Good hunting. LB