A Horsefly is an insect native to the planet Na Pali in Unreal. They are harmless and cannot be harmed by the player. The Horsefly can either be found in a swarm preset into the map by bodies of water (which is the basis for map appearances for this creature) or will appear over corpses of dead creatures (not preset) if the corpses have been rotting for a length of time. They often can be heard buzzing and flying around a specific location.