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

Fresh Zhevra Carcass

NPC	Level	Zone	Chance
Zhevra Runner	13 - 14	The Barrens	100%
Zhevra Charger	17 - 18	The Barrens	100%
Zhevra Courser	20 - 21	The Barrens	100%