At at about 3 pm I was in the yard and heard more than one aircraft and turned to observe two cubs in what at first appeared to be formation flying but at as I watched it was apparent they were converging. One of them did an abrupt bank away from the other at a distance of no more than a couple hundred feet. He did not peel away, it was an immediate manuver in order to avoid a collision. Both aircraft were at the same altitude. Probably about 1000 indicated which is very common to see in this area and around the valley.
Got my attention!