The air grew crowded with the racket from the observers, but… there. A disturbance in the magnetic field, invaders coming from beyond the sky. In other places, Eagles defended the world from the invaders, but this was Hollowquill's territory. Her sensitive magnetic sensors pinpointed the invaders' path down. She trained her laser, leading just a little, and fired.
Walking below, a human looked around at the "tschuu tschuu tschuu" sound. Down the block, other birds were raising a hell of a racket. "Stupid bird, sounds like a space laser," he laughed, and walked on. Behind him, a mother bird brought the morning's bounty to a hungry nest full of babies. The Earth was safe for another day.