The other evening while bow hunting, I heard something I've never heard before. It was 3:00 PM and I heard several whooshing sounds coming from a bluff north of me. It sounded like a hunter opening a nylon tent or snapping a canvas tarp to lay on the ground. This went on for several minutes. I looked and noticed what turned out to be two Does standing about 50 yards away. Like most of us, I have spent a lot of hours in the woods during my life, and I've heard a lot of deer vocalization but this was very unusual. The vocalization I most recently heard was not a snort. One of the Does was standing facing away from me and her attention seemed to be in the opposite direction of my location. I was never able to actually watch the deer clearly as the vocalization was made due to foliage between the deer and my location. Eventually, the deer moved up the ridge and paralleled my location.
For additional information, I was wearing a Scent Loc type suit and used a cover spray on my clothing before going to my stand. Not sure if they were reacting to the cover spray, which was a fall type scent spray.
Any ideas?