People who have heard what a bald eagle sounds like through movies or television shows are led to believe the call of the national bird of the United States sounds fierce.

But the truth is, that eagle has been dubbed over. That classic screech is actually the sound of another raptor: the red-tailed hawk. It sounds like this.

It's like something out of a movie: Video shows two birds perched on a dying cottonwood tree in Colorado. Suddenly, the nest explodes and both birds are knocked unconscious.