Because nature fascinates me and predators especially of interest, I thought this article might interest other readers. I had never heard of this happening, but it makes sense as wolves kill coyotes. So it's not as though predators won't attack each other-- when either their food supply is threatened or/and they believe they can win.
People often make the mistake of painting predators as superior in motivations to say humans. They might be less complex in their motives, because they have more problems in getting food which keeps them down to basics (and their breeding is more seasonal and biological with less emotion-- we think), but superior? Not so much. We are all just animals in the end. We do what we do because we feel it will benefit us. Humans can operate a little further out there for what we think that will be but often we are shortsighted and base in our motives. Because we have a more complex language, we just paint ourselves loftier.
Going along with this, before I had a chance to publish, came the following story which led eventually to the killing of the cougar as it simply approached too close to too many humans with no fear. Cougars can be quite curious and innocent in that curiosity and then again they are predators who must kill to live.