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File:Keelbug.jpg
A sketch of the Keel Bug.

The Keel Bug is a deleted Covenant species seen in the Halo 2 Collector's Edition Video. It was supposed to come into the battlefield, cut up dead bodies into sections, and then fly off with them, as a way of cleaning up the bodies. They were originally going to be used in Halo: Combat Evolved as a clever method of removing NPC corpses to free up memory. This race would have been a gruesome addition to the Covenant.

The concept of an insect-like creature as an enemy may have led to the design of the Drone that appears in Halo 2 and Halo 3. The Drone picking up the Marine in the level Crow's Nest may be a reference to Keelbugs.

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