I also wanted to add a pretty terrifying account to this thread...
Sometime in Jan/Feb of 2011, my wife and I walked down into Quillan Creek from western side of Sipsey to explore some of the more remote tributaries. We underestimated the distance/time and were about 1.28 miles from our park near the road. It was almost 8pm and completely dark. As we were making our way up hill, I hear some rustling uphill and off to my right. Then I heard what I thought were muffled voices, but nothing you could make out. I immediately thought we had run into a person camping, but there was no fire, no lights...and I'm pretty sure that no one would be sleeping/hangin out on a incline like that.
The next thing I heard...and I have been in the woods for nearly all of my 37 years...was absolutely the most terrifying sounds I have ever heard anywhere. Something BIG was there. All of the sudden it sounded like it picked up a log and was pounding it against a tree harder than I probably could. It also sounded like it was shredding the bark off the tree. If that was not disturbing enough, it let out a blood curdling scream...again and again. Banging and screaming...
We stopped in our tracks... after about 2minutes...it seemed like an hour...whatever it was crashed away through the woods back down into the canyon. I shined my flashlight in the area where I thought the noise was coming from, but the brush was so thick I could not see anything. I even shouted out several times thinking it was a human. I even drew my gun which I rarely even do when I come across the hogs.
I am about 185lbs, and this thing sounded bigger than me. I just cannot think of anything that could bang on a tree that hard besides a human. Maybe it was some bigfoot researchers out thinking we were bigfoot haha.
So if anyone has heard anything like this, please let us know. I've heard bobcats an foxes scream...all sorts of owl noises, but this was completely different!
Oh for anyone interested, here is our "pic dump" of some of our adventures at least the times when I brought the camera anyway
http://wildalabama.blogspot.com/