I've had to leave elk out overnight a number of times while I went for my llamas. So far, so good. We don't have griz here but we're not short of wolves and black bears.
For the record, leaving a whole elk in the woods over night makes for the most tender meat. By morning, it'll be largely out of rigor and ready to cut up. I'd rather not have to leave it in the field but it does have a plus side.
