The Antlion group mentality makes up for their lower health totals: an individual Antlion is relatively easy to kill, but its friends will attack while the player is occupied. It is also possible to flip the Antlions over with a burst from the Gravity Gun, allowing for a quick escape. Refuge may be sought in water, since Antlions cannot swim and quickly drown when they come into contact with it. Unless covered, burrows continually spawn Antlions to replace those killed. Half-Life 2: Episode One introduces the concept of Antlion burrows, essentially large holes in the ground from which Antlions spawn. If the player is still on sand when one is killed, another will spawn to replace it. In Half-Life 2, a swarm of five Antlions will usually emerge when the sand is disturbed. The Combine refer to Antlions as 'virals,' 'biotics,' or 'exogens', as a soldier can be heard mentioning a 'full biotic overrun' of the Nova Prospekt facility however, the term biotic may also be a general term used by the Combine for any hostile life form, including Antlions and headcrabs. Once on the surface, Antlions can fly short distances to rapidly approach their prey. This makes it possible to safely venture through Antlion territories by walking solely over foreign items placed on the sand, or by walking across rocks. Antlions sense a victim's presence via vibrations transmitted through loose soil or sand. Their aggression is not limited to humans or the Combine, and they will attack other xenofauna such as headcrabs. They usually hide under the sand, waiting for anything to venture near, at which point they quickly surface and tear it apart. Antlions live in underground colonies, typically situated in sandy areas such as beaches.

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