Hbong'ar

The Hbong'ar are a race of alien sophonts from Tau Ceti e, a large rocky world orbiting the nearby star, Tau Ceti. Unlike humans though, their level of civilization is much more primitive, being more similar to that of the native Americans, except for a large empire, similar to the Roman one. The four smaller pictures show certain distinct parts of the creatures' body:

A- What seem to be the creatures limbs and lower jaw, are actually a highly derived lower jaw, with the lower parts being used for walking and the upper part, which used to be a bunch of small bones behind the lower jaw, to which muscles that move the jaw forward were attached, is now used as a lower jaw, each "limb" having two such parts that together work as one lower jaw.

B- Originating as radula-like organs in each side of the lower jaw, two long tentacles have evolved and are used as the main manipulators.

C- While Hbong'ars do have eyes, their main sense is echolocation. A beam of sonar is produced by the pneumatic muscles located in the upper jaw, which after hitting an object, bounces back to the creature, which then senses the nearby object via it's sensitive snout and ears located behind the limb-like lower jaws.

D- The aquatic ancestors of the Hbong'ar used their skin to breathe, similarly to some modern day amphibians, though as they moved to land, their skin evolved into a lung-like organ behind the head.