Not really.. both were at one time highly popular mythical creatures, both not thought to exist. Perhaps different circumstances.. but not different topics. I never said bigfoot wasnt sentient, but even so.... to persist that just to hide from the human race you have to be sentient?... cockroaches are a known species yes, but how many times have you seen one?.. and there are THOUSANDS in your house probably more.. (depending on where you live.. its NOT dependent on your living conditions).. stray cats are abundant in my apartment complex.. (only since I hear them at night do i know this) and yet, I've only seen one. and these are all places that we are around ALL THE TIME.. go to the sierras or the rockies.. how many people are there? not very many... we may know of the rockies.. we may have technology that can see them and measure them.. but i can guarantee you not every square mile is watched or even explored to the fullest extent.. hell.. i bet you that there are cave systems above and below ground that we have yet to even discover.... which a non sentient animal could hide in.