I live in the PNW. I might be considered to be still on the fence on this issue although Im probably dangling by only a couple fingers. I have had a few experiences I cannot explain while in the deep forests of the Northwest.
In 1994 I went deer hunting by myself in the coast range. I got off work at 10 pm and made it to my camp after midnight. My camp was beneath a large tree at one end of a large clearing off a dead end dirt road seven miles off the highway. Unlike the busy elk season I saw no other camps, vehicles, or people the whole way in.
I pulled off the road and parked my truck facing the big tree with the headlights on. The clearing was U shaped and surrounded by timber. The big tree was at the bottom of the U. To the left side of the tree was a thick patch of blackberry about 9 feet high and 60 feet long extending into the timber. On the right side was a trail that led to a small stream That followed the right side of the clearing.
I turned my truck stereo on and set up camp by the light of my headlamps. After about 30 minutes I was finishing setting up my tent when the hair on the back of my neck stood up. I stopped what I was doing for a minute, looked around, then dismissed the feeling and went back to work. A minute or so later I thought I heard some type of noise over the sound of my music. I walked to the drivers door and turned the music off. I listened for several seconds. I heard nothing. I figured it was either my imagination, or possibly a coyote howl. I turned my music back up and went back to setting up the tent.
A minute or two later I clearly heard a loud crack over the music. It sounded like a very thick branch snapping behind me to the left of my truck. Again I walked to the drivers side door,turned the music off, and listened. Silence. After perhaps two minutes of silence I turned the music back on. I figured there might be a herd of elk back in the timber so I went back to my tent. A very short time later I heard another loud crack, this time very clearly and much closer, over the sound of my loud music.
Again I went to the drivers door and turned off my music. I stood there in silence for a long time with the headlights shining on the tree in front of me. I could feel someone watching me. After several minutes I heard a very light muffled crunch from the trail on the other side of the blackberry bushes, about 80 feet away to my left front. About 15 or 20 seconds later I heard another muffled crunch slightly closer. I yelled a very challenging "Hello! Who's there!".................... Silence. After about a minute two or three more footsteps spaced 10-20 seconds apart. The sounds reminded me of the sounds I make at 250 lbs while stalking quietly through the woods.
By this time the sound is only 50-60 feet away behind the blackberry. Figuring at best it might be some drunk hunter playing games or a elk with a death wish or worst case something that was gonna do me harm I yelled, "You better quit fucking around I have a gun".
I had a S&W Model 10 38 spl. in a shoulder holster that I drew. My hunting rifle was cased behind the seat under three feet of gear. After I yelled I figured I would hear brush breaking from an elk, deer, or bear running off. Nothing. After about a minute another soft step, closer. I yelled at the top of my lungs "AAAAAAAAAAGGGGGGGGGGHHHHHHHHHH!!!"
Silence again. After about a minute the stalking noises began again, soft foot steps, twigs cracking, closer. I had enough so I fired two shots into the trunk of the big tree. The shots echoed for a long time. I heard no brush breaking, no running etc, nothing at all.
I waited in silence for the longest time then again I heard the subtle movement in the darkness behind the blackberry's only about 30 feet away now. To be honest I was in great fear by this time. I aimed my model 10 towards the sound only at an angle about 10 above the ground and fired two more shots. The sound echoed for a long time with no brush breaking etc. After about 1-2 minutes I could distinctly hear regular unmuffled footfalls walking away from me. Whatever made the sounds was walking back the way it had come. This time it moved at a slow yet regular pace like it was not afraid of anything or trying to conceal it's movement. I stood there and listened until I could not hear the sounds anymore.
I did not bother to take down my tent. I just picked the whole thing up and threw it in the bed of my truck. I threw my pots, pans, and everything else right on top of it. I was gone within 90 seconds.
I drove straight back to town and woke up my friend at 3am. We drove back out that morning when it got light out. I explained everything to him. We walked behind the blackberries. There were spots in the ankle high grass that were flattened and devoid of morning dew. The spots were 1 1/2 times the size of my size 13 hunting boot. At 6'3 I had to uncomfortably stretch my legs as far as I could to put my boots in the spots of flatened grass.
What was behind those blackberry bushes? I don't know and I hope I never find out. I won't go into the forest alone anymore.
Since that time I have seen or heard some odd things. About 4 years ago in January I was setting up steel plate on one mountain side in the coast range so I could shoot at it from the opposite side. It was 400 yards as the crow flew but a 15 minute drive up the logging roads. There was snow about 6-8 inches deep. For 1-2 miles I broke fresh snow up to the target site. No vehicles had been up there. I turned off the lightly used dead end road. I turned a corner and came on a straight section of road about 200 feet long. As soon as I came around the corner I saw it. Footprints in the fresh snow going down the road from one side to another at a shallow angle. I got out of my truck. The tracks were 1 and 1/2 times as wide and long as my own feet. Snowshoes?? The went up a steep slope and dissapeared.
Another time a friend and I heard a 15 second long, very loud, modulated vocalization in a extremely remote section of the cascade range. I cannot really remember it but if I heard it again I would know it. Neither of us could reference anything even close to it.
Makes you wonder if science truly does have all the answers.