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"The Swarm Flock - a flying group of Swarm Leeches - will be your worst nightmare."
—Official Gears 5 statement.
A Swarm Leech is a type of creature found within the Swarm. They are capable of flight and hunt in packs. They also have the ability to possess COG technology such as the DeeBees, creating Rejects. When it comes to humans, a single Swarm Leech will either explode on contact or burrow into the chest of a human and expel right back out, killing the host. When hunting in packs, the Swarm Leeches are called a Flock.