Birds are dying in one of two ways. In some cases, they imagine the shining solar panels to be bodies of water and dive straight into them. There they die when they smash into the panels from the sky.
Others "feel the wrath of the harnessed sunlight." The ultra polished solar mirrors bounce sunrays strong enough to burn the feathers off birds that quickly crash to the ground, caught in the wrong place at the wrong time.
Many of the fowl dying as a result of their unfortunate flight paths over solar facilities are birds protected by the federal government under the Migratory Bird Treaty Act.