Black Triangle Sighting in Temecula, California on March 29th 2016 – UFO appeared transparent was dusk, but could see outline

My wife and I were in the backyard and we both were looking for shooting stars when we both saw what we thought at first was a flock of birds, then the object changes direction and shot off to the side. The object had no noise, was almost transparent with some white, no lights, no noise. Almost like the sky above was projected on the bottom. I had seen 3 of the same triangle shaped objects one night a month or two ago but thought, no I must of just seen something wrong and it was for a few seconds and went behind trees where I could not see anymore. This time my wife was sitting right next to me so I knew we were both seeing it , she estimated 7-10 seconds that we saw it. It is hard to describe, triangle shape, low to the ground under 1000 feet, almost transparent.