The urgrinox was an extinct animal native to Clak'dor VII. It was an ancestor of the mutant urgonox.
Sources
Creature Feature: The Sarlacc of Aargonar on Wizards.com (original site is defunct)
The urgrinox was an extinct animal native to Clak'dor VII. It was an ancestor of the mutant urgonox.
Creature Feature: The Sarlacc of Aargonar on Wizards.com (original site is defunct)