Wikipedia
Kelgian (Sector General)
A Kelgian ( physiological classification DBLF) is one of about seventy known intelligent species in the fictional Sector General universe, and one of the most common species in Sector 12 General Hospital itself. Overall, A Kelgian resembles a 5–6 ft. long furry caterpillar whose fur is constantly rippling in various patterns. The motion of the fur of a Kelgian is a completely accurate guide to what it is feeling and necessary for communication within the species itself. This trait makes the Kelgians completely incapable of any form of untruth.