Nearly every time when running, I see large numbers of monkeys--like, 40+. They aren't really much of a feature anymore.
However, I still tend to twitch when I'm running and there's a large rustling in the leaves/bushes next to the trail and I don't see what it is that's moving away from me. I'm sure 99.9% of the time it's just a monitor lizard of a size less than 1.5m...but that 0.1%...?