One of the more commonly reported sounds is wood knocking. Now whether wood knocking also includes vocalizations, hand slapping or rock clacking is open to debate.
Another type of knocking or banging heard in the woods is what sounds to be banging as if on metal.
From the book Gorilla Behavior by Terry L Maple and Michael P Hoff  (Van Nostrand Rheinhold Co., New York: 1982 ) we read on page 197,
“In captivity, as we have seen gorillas incorporate the built environment into their aggressive displays. They will drum, pound, and kick against any surface that reverberates the sound. Their use of the environment to create noise may be seen as a kind of tool use, and in gorillas the behavior is clearly an extension of their natural chest-beating display.”
Chest-beating has also been reported from this location. Using a remote recorder I recorded the following sounds on the night of the 30th of March 2011.
Click here to listen to sound clip:Â Â Metal Banging 2Â
Waveform View
Spectral View
Each one of the ten bangs is very short and at a distance, therefore the signature on the photo above is small. Â There is old farm equipment close by so perhaps something was banging on it.
going by what i'm hearing it doesn't necessarily sound like banging but more of the breaking of limbs on trees. This is based on the fact that the sounds have seem to kind of carry on towards the end as if you were to break a twig and the last few fibers break shortly there after. It also seems to sound like an old tin roof that's still mainly connected.
Sounds to me like someone shooting into the ground???