Yesterday I saw some ants on a gravel road. I don’t know the species but I am guessing Formica obscuripes. As near as I can tell a number of workers are holding down and killing another worker of the same species.
But I don’t know. Ants have interactions that I don’t understand.
And the world goes on.
The roused bear 
Great photo! Ants are fascinating, and I often wonder how many species are in my garden — at least five I think.