----Have any "nests" ever been found?----
A professional geologist/engineer that I knew was a smoke jumper for awhile. He said one time they had jumped into a remote site in Northern California fighting a fire. They came across what he claimed might have been a "nest" - large trees and brush piled up and wedged in between trees to form a 3-sided (as I recall) "fort". However, he said they were about 50 miles or some such distance away from any roads or trails. He said it also stunk to high-heaven. He wasn't the type to maake stuff up.
I like to think that there is something running around out there that we don't know much about. Plus - they make great bedtime stories for my kids!
Those bed times story's are not always so great. My older cousin (about 15) and I were staying at my grandmothers one summer. A younger cousin came (about 8) to stay for a day or two. While he was there Les (my older cousin) and I engaged in a late evening conversation about sasquatch while our younger cousin listened in. Later that night the young cousin had a strange odor about him and we asked grandma to investigate it seems the boy had shit himself because after our conversation he was afraid to go down to the outhouse.