I used to be a power lineman. Large bird fatalities are a common occurrence. Their wing span is wider then the separation between the lines, and even at the local distribution voltages, (14.4KV phase to ground, 25KV phase to phase) an arc can jump about 4 inches. Not much can be done to prevent this, other then rebuilding all the power lines with a much wider separation between the wires, and extra insulation on all the switching structures. All this would lead to a higher power bill.
The office I worked in had an amateur taxidermist who worked there. The reception area was full of eagles, hawks, and owls.