UFO Sighting: Glowing Swarm over California

UFOs, Birds or UFO Birds? I looked up and saw a few birds in the sky. Then the small group of birds began to multiply in size. Birds seemed to manifest out of thin air until the birds started not look like birds anymore. They appeared to take on a glowing orb like shape and yes I'm familiar with birds reflecting sunlight, but after watching them I had to film it. I do believe there could be something else going on here. Yes, it could be an optical illusion, but our world is full of illusions.