This is a somehat long story but i will try to shorten it the best i can without leaving out anything. I also reported this to the Western New York bigfoot association and contacted back and forth with thier director Mike George. He was suppose to come down and meet me so that i could take him out to the location this vocalization occurred , unfortunatley he never made it down. This happened to myself and my long time friend and hunting partner back in winter of 2001. We were out grouse hunting one day in an area know as "Michigan hill" , a state owned piece of land 13,000 acres big near Richford , NY . We had hiked a mile and a half or so off the road with no luck finding any birds when we came upon a large thickly wooded gorge with a creek running through the bottom. We decided to head down the very steep hill into the gorge hoping that in the thick pine and old apple trees would be a few grouse. Once reaching the bottom and crossing over the creek we were both stopped dead in our tracks by a sound which made both of our hairs stand on end. A series of screaming growls which i can only describe as i have before as a 700 pound hyena with a serious bad attitude had stopped twop grown men with guns instantly. i will tell you as i told the WNYBIC , I have been hunting for over twenty some years and have never , and I mean never heard anything such as this in my life.Well anyway , after two or three of these vocalizations ,which were coming from only about 30 yards away or so through the very thick trees , we decided to move a little closer. What happened then was what really put the scare into us , As we split about 10 yards apart and started to move towards the sound it seemed to move around my partner almost as if it were flanking him , when it moved you could here it walking through the snow and breaking branches and smaller tree limbs , it definitley weighed alot more than in my opinion him and i put together. We moved a little more before it vocalized a few more times and moved to our left evn farhter as if it were trying to get behind us. Needless to say with all this happening and the constant barking of the dogs from the farm up by the road we were actually getting scared and nervous, whatever was in those trees didnt want us there . after about three or four minutes i glanced over at my friend whom at that time was down on one knee with his gun shouldered as if whatever was there was heading for him . He looked at me and i motioned to him that i thought it was time to leave that area and whatever was down there and headback to the road and truck as quickly as possible. We did just that moving very quickly but cautiously, the whole time looking back over our shoulders till we made the truck. We never spoke to much about what happened but never went back to that place. A year or so later i told something of the story to another friend and huning partner of mine , he was playing with me and said "hey maybe it was bigfoot" , up until then i never thought about that at all, then one day the same friend played me some supposed recording of bigfoot that he found on the internet and my jaw dropped , a sound i hadent heard since that day a little over a year earlier was playing in front of me , belive me when i tell you the chills were enough to kil ya. I had him record the sounds and i called my hunting partner who was with me that day (he had moved to florida ) , i played the sounds over the phone and he had the same chiiling feeling. It was indeed , 100% positive , the exact same vocalizations we experienced that day hunting. A month or so later i contacted the WNYBIC and he i sent them this story along with the tape explaining that the sounds on the tape are exactly what we heard that day , i wanted to know exactly what they were. They responded with two of their own tapes which contained even more supposed bigfoot vocalizations. i could not believe i was hearing the identical sounds we heard that day , then They even top it by telling me that there have been several other sightings and vocalizations from that area and that they would like to come down and check it out for themselves , that was the last contact i had with them , a letter along with the tapes from 2/4/02. I just wanted to share our story as i have never in all my years been a believer in a creature like this but will tell you my mind has remained totally open since then. I am not exactly sure what we heard or what was there , but i will guarantee that it was there.