A little trickier than obtaining a Bristleback but still just as easy, you'll need to be in Verdant Brink at night time and have access to Basic Gliding and Updraft. Firstly, go to the Shrouded Ruins Waypoint and take the Pact Choppa to the canopy. Once there, you'll need to use the Updraft to land on the Wyverns platform. Avoid him (by going around the edge) and make your way to the opposite side (as if looking east). You need to jump off and follow the Updrafts to the opposite island below. 

Once on the platform, run across it to the opposite side and jump off. You can then glide to the opposite platform.

Just be careful of any adult Fire Wyvern's as they cause lots of burning and you could die before you tame your new pet.