My husband just went to hunt elk in the Rogue river OR area. I called him while he was sitting up in the Mt under a tree. I asked him if he heard whoops or tree knocks yet? He said "what do you mean"? I whooped 3 times in the phone loud. He laughed at me. 5 seconds later they started whooping back😂 He said OMG!! Listen!!! held the phone out. I could hear them calling back. He made stay on phone with him for an hr until his guide returned. This is an awesome subject. Juan O Savin sent Nino to YT channel "The Facts Of How To Hunt. disclosure is coming.