Possible rock-knocking heard by hikers near Pitt Lake witnessed in British Columbia, Canada

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This incident occurred in September 2001. My girlfriend and I and our two dogs were finishing a hike through the Boise Valley north of Pit Lake in SW B.C. After 7 soaking wet days of bushwacking through this unbelievably wild and remote valley (especially considering it is so close - as the crow flies - to Vancouver), we had come out on a series of logging road which left Boise Valley for Pit Lake. Here, right beside Cougar Lake, we made a small fire to dry out our sodden cloths and take a brake from the hike. After about a half hour there, we heard a strange noise coming from the forest on the south side of the road. The sound could be described as two rocks being struck together. This in itself was not so strange, but the sound repeated itself at regular intervals of 5 seconds or so, on and off, for a good ten minutes. Immediately after this started, our dogs put their tails between their legs - showing absolutely NO desire to find out what was making the sound. This was perh...