Footprints in Lewis County, Washington

Live pretty far into the foothills of the cascades near Cinebar, WA. Had a camera (Astak Mole) out on my back porch to capture animals in my yard (for fun in the summer - we see Deer frequently and Bear occasionally). I was laying in bed listening to the audio through the camera (it has a pretty sensitive mic) and heard some odd "wooping" in the distance. Luckily a moth or something set the camera off and it recorded two of them. I think I heard about 4 total - two are on the video file I have and will mail it to you. They sound like they're loud but distant (resonates off the hills a bit it sounds like). This was Aug. 27, 2011 at 11:41 PM. Sunday morning, January 22, 2012 got up and looked out my bedroom window to look at the snow (we had almost 2 feet total but it had been raining for days so it was dwindling). The tracks were starting to really show up as the snow melted - noticed my ATV tracks through the back yard from Monday or so, several sets of footprints from my son and dog, then an odd "dotted line" set in between all of them. Took a picture from my window, went to church, then came back and took more close up shots and measured the distance between the "steps" which were between 5 and 6 feet consistently. They were in a straight line going from one tree in the back of my yard directly to a large tree in the middle of the yard (not around it, but directly to it which I thought was weird) then a set of prints turn right and head to another tree at my property line with my neighbor to the East and don't know where from there. I also couldn't track the steps out the back of the property - the snow was melted a lot more and there was no obvious direction. There's a private dirt road behind my property and on the other side of that, acres of trees. On January 27, wondering if this is some frequent path I set up a trail cam on the path and captured what sounds to me like walking up to the camera (the IR's didn't fire due to low battery I think) but the picture's black - but you can take a listen and see what you think...not conclusive, but interesting I think anyway. Got some fresh batteries out there now.