Flood swarm form

The Swarm is a variety of airborne Flood combat form. Swarms usually travel in groups and attack with barbed projectiles. They are relatively weak, but can easily dispatch most infantry.

Description
Flood Swarms are infected aerial life forms that have been infected by the Flood and repurposed for the parasite's use. They possess a relatively hunched body, two bony wings, a gaping mouth, two eyes, and a pair of elongated trailing limbs. Like the Coordinated Stage Flood Ranged Form, they are capable of launching barbs at potential hosts, though the exact mechanism for this is unseen in the Flood Swarm forms.

Trivia

 * The Flood Swarm appears to be the only Flood form to use eyes rather than the traditional Flood sensory antennae.
 * The developer's description of these creatures as "infected buzzards crossed with evil bats" implies they are in fact native organisms that have been infected by the Flood and integrated into the Parasitic collective. This is a theme and motif that dominates the Flood presence in the game, which can also be seen in the stationary Flood forms in the game, and two other mobile forms, specifically the thrasher form and the bomber form.
 * The face of the Flood Swarm resembles that of the titular monster from the film Cloverfield.

List of appearances

 * Halo Wars