RE: hog calls
The cotton tail screamer sounds real similar to the squealer call. The squealer call is an alert call though. I've seen it be a lot more effective after lets say taking a shot with a bow and they scatter. You can sometimes call the sows back in for another shot. Everytime I have shot one with a rifle or shotgun and they squealed, the others didn't stick around to protect anything. It is supposed to kick in their natural protective instincts though, but I have had a lot more success usinga grunter call to mimic a boar hog as I walked back and forth from my stand. They will right you off until they see you standing upright. The grunter does calm them down. I personally use and sell both on my website.