This was something unusual OBFE ran into on expedition 3 in Nov 2009. There were fairly large branches placed up against a large tree.
This is a possible small shelter that was put together in a formation of some kind. Could be just a direction marker of some kind. It was found near the large shelter where a deer bone was found.
Here is another recording of an actual knock at night near where me and my son were camping at Echo Lake.
These were found as they were. No human trash around or near the shelters. They were all abandoned. And they were all found in the same area, just yards away from each other.
This is an actual sound recorded by us up on a logging road near echo lake B.C. The volume will change so the wooping sounds can be heard from the sasquatch in this area.