Fly

Flies are enemies in Unreal. These creatures have the shape of oversized dragonflies, with the tail of a scorpion, and roam small areas of Na Pali. Natives of the planet, they are aggressive against anyone but have difficulties advancing to other locations in the presence of other flying creatures known as Mantas.

Combat
Unlike a Manta, Flies are easily killed and can be taken out with any weapon. They are also slower than Mantas, and can be more easily targeted. They do, however, have an extremely small outline when facing the player, and follow you until they kill or are killed.

The tactics used by the Fly to attack its prey are simple: Fly towards the prey as fast as possible, (ignoring all incoming attacks), and use the sting found on the tail's tip to attack. They are slow and weak, but capable of ambushing the enemy when it least expects it. When they aren't attacking, they'll just roam their area by walking or flying.

The Fly is arguably one of the weakest foes in the game. Their buzzing sound gives them away immediately, and their low health and speed make them easy to defeat. Use the Dispersion Pistol or Automag to avoid wasting firepower. Flies usually appear in otherwise empty rooms (like empty Nali huts, or small empty rooms in temples) and are, like the Pupae and Tentacles, more annoying than dangerous.

Trivia

 * According to their scripts and animations, Flies were supposed to have a long-ranged attack as well, shot from their tails. The idea was dropped, probably to make them less dangerous.
 * In Unreal Editor, they are referred to as RazorFlies.