Human lungs can be seen attached to the Flier's back, and it is possible that, similar to the Wheezers, these have been mutated into chemical production chambers and are used to help generate lighter-than-air gases that fill up the lungs and help Fliers fly. The arms are twisted forwards and fused to the cheeks, forming a crude 'frame' for the wings. They share a similar basic body structure with the Infector and the Leaper, but their relationship -if any- with this Necromorph is unknown (however, it is possible that they are less/further mutated versions of the leapers.) A Flier seems to consist of an upper torso twisted and flayed into a shape vaguely resembling a stingray, topped by a partially-skinned human skull and possessing a 'tail', presumably composed of either intertwined nerves, a dangling spinal column, or both. However, they are quite hard to hit from a distance, and the speed with which they can dive makes waiting for them to attack the player and then shooting them, a tricky proposition.

This is helpful, as they have only one dismemberment point: their thin tails. A single hit will disrupt this attack and force them to fly away, and they cannot take much damage before being destroyed.

They are uncommon, appearing in only a few stages and in small numbers, and are not very threatening - their sole attack is to fly past the player and attempt to bite or slash them with their tail as they pass. Fliers are one of two types of Necromorphs unique to Dead Space: Extraction, the other being the Grabber.

Dead space extraction chapter 10