Raven, Raven, On the Rail

We are being attacked by ravens!!!!! Is this what Alfred Hitchcock meant? Every day there are 7 or 8 Ravens hovering, perching and making their atrocious noises over our chicken pasture. Last week they killed a hen. We've also seen them walk out of the coup with egg in claw. This is terrible, really terrible. The noises are horrible. They are so clever and quick. I've been shooting rounds into the air to scare them off. Our presence is our only defense right now. When will this pass??!! It's never been this bad before!!