This morning, I heard the crow call, and went out to see. One RTH screamed and flew to the tree, the other followed and he/ she sort of scrapped a part of the other tree. I thought it went for a small bird. But I noticed there was a big brown lump there. And when the two RTHs meet, I don't see any feeding or signs that they got food. I was very excited to get them in the same frame. Then I went back to see that lump, and I hit the jackpot. A great horned owl. That's why all the residence predators were so upset. He/she is still sitting in the tree facing my backyard.