Knocking in Penobscot County, Maine

I was not in any way aware that these creatures existed in Maine, firstly. I am from Connecticut however I have spent years in desolate oilfields across the U.S. including places like West Texas, the upper Peninsula of Michigan, and the Everglades of Florida. I have a vast knowledge of wildlife as I have always taken an interest to it and spent years IN the forest. My point is, what I experienced this day has shaken me to the core as I know my encounter was nothing "normal". In the Northwoods of Maine in a town called Greenbush, (population 1,400) I purchased 80 acres of wilderness with virgin forest on the back half of the lot. (meaning not even loggers have been there, it's that desolate.) I had rented an excavator and for this entire day I had been cutting a road through swamp, hills and forests to a high hill I call Hope Hill on the virgin most desolate corner of my land where I want to build my cabin. I had made it halfway and in the swamp I realized I was out of fuel. I shut down the machine and get out. I step down onto to road and was admiring my work and just relishing in the whole idea of pioneering this new path. Suddenly about 50 yards into the tree line I hear a bang with a stick on to a tree. Like someone was hitting a wooden bat against a large tree trunk as the percussion was unmistakable... At first I thought "Oh crap there is a moose" because it is mating season for them and they are known to ram their antlers against trees to intimidate their foes. Suddenly, the sound happens again. Now I am certain this is no moose as no branches are breaking, there is movement, no grunts, nothing... Just this wooden thump just through the trees where I can't see. I begin walking further away because I'm obviously freaked out. Again, but now 2 knocks... I grab a large branch I had just ripped down with the machine and smacked it against a large tree trunk. Immediately I received a knock in response. I wait around 45 seconds.... I knock again, BANG it knocks right after me again... I knock again 5 seconds later, it responds again right back.... Now I am shaking because I know what I presume this creature to be. It's obviously strong because the bang was very loud. Intimidating... I knew there was a certainty I was interacting with Sasqauch. I went back to my trailer on my qaud which was parked about 200 feet down the trail. I FLEW home. I calm down, now I am questioning reality and am quite, scared I guess. This is my land, I'm only halfway through making the road, these are my thoughts, so I decide to ride back... I knock again. It responds. I take my phone out. Turn on record on video, I knock, it goes away... Almost as if it knew I was recording. Regardless it was incredibly perplexing. I got back on the quad and went back home knowing for sure what I just experienced was legitimate. I brought a feather bead string thing from a dream catcher and brought it out there as a gift. It's been 3 days. I haven't gone back to see if it's still there.