Directly from the Guild Wars 2 wiki because it explains what a Choya is better than I currently can:

"The Choya are plant creatures native to the Crystal Desert. They attack their foes with needles shot from their body. Upon dying, they explode, dealing damage to nearby enemies and inflicting conditions.

There is a peaceful village of choya atop of a mesa at Brightwater Inlet in the Desert Highlands. It is said that this village remains peaceful because the choya kick troublemakers off of the mesa, preventing their return. According to Explorer Beth, they literally kick them off of the cliff. This implies that all the hostile choya seen across the desert are these trouble-making choya, or descended from them."

They are Very Relatable (to me), like the Skritt. This is just the sketch stage of a personal engraving project that was just too good to keep to myself.