should not be too big a task if a person has the right equipment.Some in this hunt think rainfall amounts,pine trees,and mountains play a part in it.Maybe they do,but there is more to it than that and geological knowledge is starting to look like the KEY issue.For us here in the MN/Wisc area that means fault and subsidence zones.Where a creature who might want to dwell within the earth has to also have access to erosion tubes in the bedrock.Sandstone or limestone caverns that once carried groundwater and are now cool safe havens for the most secretive and elusive creatures on the earth today or any other day.Not only is Bigfoot rare,but he alone possesses the rare skills,strength and intelligence to put together a flawless plan and way of life and death.On a personal level,every one of these creatures that I have encountered have one thing in common.Easy access to sandstone bedrock,especially where faults from ancient quakes and volcanism has created passages within the earth.Realize if you will,that tghe water that we can see on the surface,creeks and smaller rivers are but a small amount of the water that enters major watershed rivers.Yes Doc,you should have your ears on!Because much of this water enters unseen beneath the bedrock. In this case that sandstone that forms much of the St.Croix river bed.The more the river drops seasonally,annually over milleniums,the deeper the seepage erodes the bedrock to meet up with it.High on the banks,midway down,near the bottom or under the river itself.Somewhere that water finds its way into the river.Your challenge is to find the much older openings that our creatures are using and disquising to take up housekeeping in those now cool dry cavens.You are no quitter Doc.See ya tommorrow ,or tonite if you have an eye on the million $ prize!