They are just feathered dinosaurs. They don't think much about what they kill. They just want dinner.
Here is an eagle owl (a bit bigger than a GHO) killing some sort of smaller raptor.
[video]
https://www.youtube.com/watch?v=2Ol4rbYPYQc[/video]
Gordon Gullions research showed that predator on predator feeding increased when prey populations plummeted. Which would seem to demonstrate just the opposite, they do prefer grouse and red squirrels when they are available, to eating each other.
Stan, I saw a great horned owl take a small house cat at twilight, a few dogs ago. The cat had a pink collar on, I always wondered if that made for an interesting pellet out of that bird.
Best,
Ted
