The bigfoot citings that get my attention are those associated with the smell of sulfur or other such foul smell. Smelling sulfur is also linked to lightning storms - could it be an inter dimensional breach that creates a rift allowing for creatures to travel over to here?
Interesting notion . . . also, some ET’s typically smell of sulpher . . .
of course . . . sulpher and brimstone goes with a certain critters’ home regions.