Krykna

These desert and cave dwelling spiders were initially brought to Korus for sport and to test combat prowess in combat arenas. However, a breeding pair managed to escape their captors and fled to an intertwining web of caverns so deep that they were never found. Over time, they would breed and feast on Dokma or any weary traveller who ventured too close to the mouth of their caves. So many in number, the caves are all but impenetrable and are now the source of Death Watch legends.

https://docs.google.com/document/d/1ATscRobj4uBe3EC1GwH-eVK6eHBZXovq3rInSCTVj1U/edit

A Sarlacc

The Sarlacc was born on Korus as spores taking thousands of years to grow to it's current size. While one is known to exist there can likely be others.