I've listened to those calls a bunch, and there is definitely something odd about them. When I first heard them, I thought "that's just somebody's dog". But, then I also ran them through spectral analyzing software trying to find a match for them, comparing them to lots of dog sounds. I also thought that they might be a large domestic dog in love. My German Shepherd howled very similarly when one of his lady friends was in season and he couldn't get to her. So, we analyzed a full repertoire of his "love songs". Nope, not that either. So the next thing I thought was that it might be coyotes. But, after spending enough time doing that to get my wife aggravated at me, I have to agree with Stan (fulltimer) that they do NOT match up to coyotes, even though I was pretty sure I would find a match, especially from an older male. But, no. So, we ran wolf howls from various places around the country through the S/W and while a few were closer, it was still "no cigar". And they are certainly NOT cattle.
A few friends and I tried to duplicate the calls doing them ourselves, with and without various megaphones, and in different places like large culverts and bathtubs, also through pipes of different sizes. And we are pretty danged good doing calls with our mouths. Even tried with a didgeridoo, elk bugle, and bull horn (real one, not the electronic kind). I've played a little with Mongolian throat singing over the years and sometimes can do it pretty well (if nobody's looking at me...lol). That didn't match either. There were several times that I thought we had nailed the sound ourselves or had found an animal sound that matched it, but when we ran it through the S/W, it was clearly different.
Conclusion:... I don't know what in the hell made those vocalizations. And I personally believe that bigfoot exists. (And yes, I already know that many of you on here don't believe they exist, but that's an argument for another time.) And, I've also recorded what I'm pretty sure are bigfoot vocalizations, but NONE of them sound like these particular recordings. But some of the vocalizations I've heard do contain the simultaneous and/or trilling high and low frequencies.
But like I said, I don't know WHAT made those vocalizations, and I DON'T think that bigfoot made them, per se. However, if you do much investigating into bigfoot sightings, you come across references to "dog-faced" ones, or "long-snouted" ones, or "dog-men", or ones that looked like werewolves, or loup-garou's, or creatures like the Beast of LBL (as posted elsewhere in this section of this forum), or as some Native Americans call them: the Nalusa Falaya. I've never seen one, but I've personally heard three reports of sightings of them, and two of them were from reputable, trustworthy, dead-serious folks. IF they exist, could these be some of their vocalizations?
