I haven't read what went on in this thread after I last posted, since we've been battling intransigent medical issues around here...
I initially liked the skeptical La Brea tar pits theory, which goes more or less, "if we don't find them[bigfoot] in it, then they don't exist in the state." After all, examples of nearly all the animals found in this region throughout history, are found in the pit.
Except people. They only found one Indian gal, and the archeologists claim she is only there because she was ceremonially "interred" there 10,000 years ago, along with a dog. Musn't go on long trips without the dog! I don't blame her. Id have requested a hunting dog, too.
Source:
http://en.wikipedia.org/wiki/La_Brea_Tar_Pits
It looks like intelligent local bipeds simply don't get trapped in the tar pits in appreciable quantities, as only one ancient human body has been found, so far. The Indians did access this local natural resource, as a means of waterproofing their baskets, among other uses, so its not like they never accessed them. They just had enough brains to either stay out, or call for help from their fellows, if things got out of hand, rather than stupidly drown in the muck.
Which is how and why our fellow biped (Bigfoot) is not represented among the tarpits victims; he either has the sense to stay out, or called on his fellows for help in being pulled out, just as a local Indian could have done.
That said,
OK, so here's at least one possible technical, although abbreviated, explanation for the "bad feeling" mentioned earlier in this thread:
Infrasound is an interesting range of sound frequency, which is pretty much defined as evathing below 20Hz.
Source:
http://en.wikipedia.org/wiki/Infrasound
Now, a lot of animals communicate with each other, using infrasound: whales, elephants, hippos, gators, giraffes, okapis, tigers, rhinos, [and who knows what else]. Elephants use their secret infrasound technology for comms, giving them a range of about 10klicks. Whales communicate for hundreds of miles in the dense medium they inhabit.
I consider this proof that infrasound is a legitimate, possible method for at least some big creatures to utilize for their comms. Elephants use it possibly for mating( heh heh!), herd direction, and scaring enemies(?!)...
Interestingly, some migrating birds may be using the infrasonic sound waves which result from wind flowing over mountain ranges, in order to navigate-- so maybe animals do NOT have to be large to perceive infrasound, only emit it.
By its very nature, infrasound is a neat way to communicate, since it travels long distances, with low dissipation. If an animal were able to make use of this comm method, it could provide approximately the range and covert utility of a primitive Walkie Talkie! Not bad.
It seems that one of the main requirements is that the animal who wants to emit in this freq, be large. All the animals on the accepted list are on the large side of the scale. Does bigfoot meet this requirement? Apparently so, judging by typical witness accounts.
So, what are the biological effects on humans resulting from exposure to infrasound?
From the above mentioned wikipedia entry:
"One study has suggested that infrasound may cause feelings of awe or fear in humans. It was also suggested that since it is not consciously perceived, it can make people feel vaguely that supernatural events are taking place."
"The infrasound and low-frequency noise produced by some wind turbines is believed by some to cause "wind-turbine syndrome" (headaches, dizziness, nausea) in humans and other animals close to the turbines." So here we see that even common machines can emit it, with the above mentioned weird perception results.
This next section is so interesting, heres the whole paragraph:
"Infrasonic 17 Hz tone experiment
On May 31, 2003, a team of UK researchers held a mass experiment where they exposed some 700 people to music laced with soft 17 Hz sine waves played at a level described as "near the edge of hearing", produced by an extra-long-stroke subwoofer mounted two-thirds of the way from the end of a seven-meter-long plastic sewer pipe. The experimental concert (entitled Infrasonic) took place in the Purcell Room over the course of two performances, each consisting of four musical pieces. Two of the pieces in each concert had 17 Hz tones played underneath. In the second concert, the pieces that were to carry a 17 Hz undertone were swapped so that test results would not focus on any specific musical piece. The participants were not told which pieces included the low-level 17 Hz near-infrasonic tone. The presence of the tone resulted in a significant number (22%) of respondents reporting anxiety, uneasiness, extreme sorrow, nervous feelings of revulsion or fear, chills down the spine and feelings of pressure on the chest. In presenting the evidence to British Association for the Advancement of Science, Professor Richard Wiseman said, "These results suggest that low frequency sound can cause people to have unusual experiences even though they cannot consciously detect infrasound. Some scientists have suggested that this level of sound may be present at some allegedly haunted sites and so cause people to have odd sensations that they attribute to a ghostour findings support these ideas."
So, only around one fifth of the human audience had any sort of perceptual awareness of their exposure to infrasound! I am currently guessing I'm in that 1/5th. Assuming I've been exposed to this freq of sound by our friend, bigfoot, I can vouch for the symptoms of uneasiness, anxiety and nervous fear.
Bottom Line:
So putting it all together, the only thing I can think of, is that when a few of them spot you, they begin their infrasonic "walkie talkie" type chatter, alerting each other to your presence. This mechanism is one possible explanation for the feelings people report.
This mechanism Does Not address the less easy to explain business of people claiming to become aware of the attention when stared at too long. I simply havent got any naturalistic explanations for that one.
I can say, that this bad feeling is very similar to letting your imagination run away with you. It repeated twice this January on the Pacific Crest Trail during chukkar hunts, and when we got close enough to the geographic area that seemed to be the source(!) of this scary feeling, it was corroborated each time by my Labs alerting strongly to hidden animals uphill of the trail. God knows what was 30 or 50 yards uphill hiding in the brush. I had no desire to force the issue at this point, and my dogs alternated between pure fear/clingy and confrontationally staring uphill.
I just said, whatever it is, I have no desire right now to find out the hard way... and so we split. That was probably one of my better calls. The minute we were out of what I would call their ambush zone (high up in Indian Wells Canyon, on the PCT between Owens Peak and Walkers Pass on a slop so steep that the path was the only realistic one for traverse), the dogs relaxed and went back to their normal search pattern for birds, my bad feeling diminished considerably, and things went back to normal.
Hey, maybe it was a big cat. Some purr in infrasonic frequencies. Eh, they werent cats.
I don't consider myself a "Squatcher". I am just one of those loner backpacker/hunter types who gets around, and wonders just exactly what does go on in the Sierras.