The lylek was the most dangerous predator indigenous to the planet of Ryloth

Ryloth Planet

, one of the few creatures able to survive in the harsh Bright Lands.
Lyleks were tall beasts protected by a thick exoskeleton and armed with sharp, spear-footed limbs, powerful jaws, and overpowering tentacles.
Few creatures were able to survive on the stifling, arid surface of Ryloth; the lyleks were aggressive and deadly and preyed on each other when no other food source was available. They were known to crawl deeply into the inhabited caves and threaten city dwellers. Inhabited caverns and underground cities were protected by blast doors and traps to prevent lylek attacks. In addition to their viciousness and strength, the lyleks' tail tentacle was also tipped with a poisonous barb. The poison itself was not deadly, but it was disabling enough to prevent most creatures from escaping.