Would bigfoot on a pogostick sound like unipedal footfalls?
^Not to mess with them, but to illustrate how easily one can have an odd experience in the woods, fill in some details, and the result can be a rather convincing "bigfoot" encounter.
The experience was real - the sound of bipedal footfalls coming directly toward us and then stopping dead about 10' away. I assume that the explanation is that a quadrapedal animal walked/bounded toward us but the cadence of its steps sounded bipedal to our ears.
. . . I truly know no-one that can always tell what type of critter is moving through the brush by non-vocal sound alone.