Since there isn't a single case I can think of where a Bigfoot was successfully hunted and killed by a hunter, I don't think there's any need to place it on the endangered species list. Now, if we all of a sudden see a run on Bigfeet (hehe) then perhaps Congress should take up the matter.
Until such time, Bigfoot is nothing more than fodder for badly produced television shows about unexplained creatures and events.