The goa lawah were indigenous aviancreatures that inhabited the world of Vortex. A poisonousmicrobe was present in their spittle. These birds built their homes in Vortex's herbaceous fields, where they deposited their ova.
Sources
The Essential Guide to Planets and Moons (First mentioned)
The Official Star Wars Fact File 96 (VOR 1-2: Vortex)