The jackal

The Kig-yar (Latin Perosus latrunculusJackals are mainly seen wielding Plasma Pistols, but they may carry Beam Rifles, Needlers, Plasma Rifles or Carbines. In Halo: Contact Harvest, they were shown to wield a Knife/Sword crystalline weapon that explodes after a Jackal has released its grip, due to fail safes inside of it. These aren't Energy Swords, as they are a purple-pink color, making it similar to the projectiles fired by the Needler. Sniper Jackals are equipped with Particle Beam Rifles or Covenant Carbines for maximum damage and range as seen in Halo 2 and Halo 3 respectively. Jackal snipers are also equipped with a plasma pistol which they will switch to if in close quarters with an opponent, however most of the time they turn around and retreat. If a player is playing campaign on Legendary, they are usually subject to many headshots, due to the Jackal snipers' placement in difficult places to be seen and killed. In addition, all but the snipers carry the hand-held energy shield. The most effective way of killing a Jackal is to throw a grenade at its feet.^[6], translated to "Hateful Highwayman") are a saurian species which would serve the Covenant as mercenaries, and later the Covenant Loyalists. Humans have termed these vicious creatures Jackals, as they are known for their swiftness, viciousness and dexterity, even though they aren't the strongest Covenant race. Jackals will either serve as snipers or scouts within the Covenant due to their excellent sense of sight, smell and hearing. They were the first Covenant species encountered by UNSC forces. I have got this info from halopedia.com