I was in the my back yard and noticed something moving slowly behind a tree west of my yard. A few seconds later, the UFO emerged on the other side of the tree and looked like black balloons floating in the air. As the UFO moved from the northwest to the southeast, I noticed it traveled at a consistent altitude and made no noise. It did not float up or move with the wind like balloons. It did not make a buzzing sound like a drone. I pointed the UFO out to my spouse and snapped 4 photos.
The UFO consisted of four black spheres that seemed connected. Photo's not available nuforc.org