Bat mounts are the standard "taxi" flying mount for the Forsaken of the Horde, but they are rare for player mounts. They have no ground animation and just hover.
This mount is purchasable from the Battle.net Shop for USD $25/EUR €20.
Wowhead "Bloodwing" in Items > Miscellaneous > Mounts
WoWDB "Bloodwing" in Items > Misc > Mount