For the last couple of years, Mike Palecek has been recording night time audio in St. Louis County, Minnesota. On March 15, 2012, just after 4:00 a.m., his audio recorder captured the howls of four loud vocalizers as they passed through the area.
Upon first listen, the casual observer might dismiss these howls as those of a wolf pack. And such a hasty judgment would be understandable given the fact that grey wolves do exist in this region. But an astute observer will notice inconsistencies in the howls, characteristics that aren't typical of wolves, and other indicators that are commonly found in suspected sasquatch vocals.
Among those inconsistencies are the existence of vowel transitions. Most of the howls in this recording initiate with an /oo/ vowel (/oo/ as in boot). But as the howl ends it transitions to an /aa/ vowel (/aa/ as in father). This is not a common feature of wolf howls, but it is seen in suspected sasquatch vocals (/oo/ to /aa/ or /aa/ to /oo/), most notably in the "yahoo" vocal.
Other indicators to suggest this is a small group of sasquatch vocalizing include; integrated wood knocks, whoop vocals, pitch breaks and a single "moan" howl with attenuated fundamental frequency. And with close attention to the loudest howls, one may also detect a hint of the "brassy" or metallic tone that occasionally accompanies the voice of these creatures.
It has been widely discussed among researchers that sasquatch are adept vocal mimics. And a number of clips do exist to suggest they possess the ability to simulate the sounds of other animals, or even machinery. The very wolf-like nature of the howls in this recording would appear to be mimicry at work. And one could reason that mimicry of the local wolf population would be an effective subterfuge, allowing sasquatch to vocalize to each other, while not standing out too distinctly from the local fauna.