Were you looking for info on the movement or transportation mode, Flying?

Flies are insects that are attracted to corpses & honey.[1] (WRPG 20) [2] (M&M 16) Flies swarm around dead creatures.[3] (APG 219) Abominations often have clouds of flies surrounding them. The flies buzz about the abomination's exposed gut, feasting.[4] (HPG 22, 204) Although flies are largely unimportant, flies can be a nuisance.[5] (RotH 96)