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

Webbed Pterrordax Scale

NPC	Level	Zone	Chance
Fledgling Pterrordax	48 - 50	Un'Goro Crater	80.0%
Pterrordax	50 - 52	Un'Goro Crater	80.0%
Frenzied Pterrordax	52 - 54	Un'Goro Crater	80.0%