What an injustice. A man has a right to protect his livestock. And as for the fink that ratted him—Snitches get stiches, I hope.
He does not have the right to kill a bald eagle.
He needs to get a dog or better yet, two, or he will have to shoot everything in sight and trap things constantly to protect chickens. A good dog will deter everything, even eagles and annoying human theives.