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"The Swarm Flock - a flying group of Swarm Leeches - will be your worst nightmare."
—Official Gears 5 statement.
A Flock is a group of SwarmLeeches. They are capable of flight (whereas individual Leeches tend to slither) and share all the same characteristics as them - biting enemies, and being capable of possessing Shepherds, DR-1s and Guardians, before turning them into Rejects, Stumps and Bastions.
Flocks, however, are more durable than a single individual Leech, being able to take a surprising amount of punishment before being destroyed, most likely due to the numerous Leeches that create the Flock. Flocks would fly all over the place, bypassing ground defenses and distracting the enemy long enough for other Swarm units to overwhelm the enemy. When the Flock attacked, a few Leeches would leave the Flock and either explode on contact with an enemy, or pierce right through their chest before returning to the Flock. Like Seeders used by the Locust Horde, Flocks were also capable of jamming communications.