One rock revealed a colony, then I pulled the next rock next to it, which revealed more termites, but also a small black ant colony, that had no idea they were nesting next to a termite colony.
needless to say fights ensured
It's funny how close ants and termites can live to each other. Recently, in one log, I found two separate Myrmica colonies, which were pretty much sandwiching a termite colony. Neither had any idea of the other's existence until I tore the log open. I've come to realize that termites are really good at hiding, and keeping a low profile.