Items, NPCs, quests, objects and spells of patch 1.12.1, read live from the realm itself.

Sleek Bat Pelt

NPC	Level	Zone	Chance
Monstrous Plaguebat	56 - 58	Eastern Plaguelands	31.4%
Duskwing Elite	60	Eastern Plaguelands	30.1%
Noxious Plaguebat	54 - 56	Eastern Plaguelands	28.0%
Plaguebat	53 - 55	Eastern Plaguelands	27.2%
Dark Screecher	50 - 52		19.3%