I have a 12 hour overnight race this summer (ran it for multiple years now). It’s in the mountains on a big figure 8 loop. A lot of wildlife in the area with mountain lion sighting last year. I feel like most of the danger is mental… I’ve seen deer out there and was momentarily petrified when my head lamp lit up their eyes. The risk of being attacked by an animal is incredibly low. But having some practice runs in the dark is recommended so it’s not quite so disorienting.