^If you do a search on the topic of the Mt. St. Helen's eruption, it is estimated that 7,000 big game animals were killed. I believe lots of bodies were found in the blowdown area.
I would also ask the question, why are Bigfoots so rare? They have no natural enemies (well, maybe grizzlies in the northern part of the purported habitat), they have no human persecution, so why are there so few of them. By way of comparison, mountain lions were given full protection in California 40-odd years ago. Despite poaching and culling of nuisance animals, their numbers have increased about tenfold since then (from about 600 to maybe 6,000). Black bears have increased their population three or fourfold in California in the past 30 years--from about 10,000 to between 30,000 and 40,000--and have expanded their range considerably, taking over a lot of what was formerly grizzly country.
My own view of the matter, given that there is a long legacy of sightings and stories of Sasquatch in the Pacific Northwest and that some tracks turn up in very out of the way places, is that there is a slight chance that something of that sort does exist. However, when you start getting sightings in the California desert, in the vicinity of Fort Worth, Texas, in Delaware, etc., I tend to think this is some kind of psychological thing, much like the Chupacabra craze among the Hispanic population some years back.
Edited by JLibourel - 12/4/12 at 6:18pm