Both adults reacted to any airborne raptor, other Eagles, Vultures or Ravens. The screaming even rattled me a little it was so intense at times, it seemed to be effective the flyovers were gone in a hurry.
The Chicks ate often seemed like every hour, then their little heads would drop... off to dreamland. Occasionally they would push each other over or have tiny wing wars but it only lasted a few seconds before they became exhausted and fell fast asleep.