Pierin A slave species of the Kzinti. They were able to develop a small space-faring civilization before being enslaved by the Kzin. At the time of their conquest, they occupied several planets near p Eridani. Presumably freed by humans.

They are multi-limbed flying creatures from a light-gravity world who resemble great horned birds at a distance. Closer up they look like occult idols come to life. Their speech consist of raspy screeches and atonal clicks whick makes it hard to understand.

Sources: Ringworld RPG, The Ringworld Engineers, Ringworld: Revenge of the Patriarch,

Other sites: Known Space Concordance, Wikipedia, Larry Niven Wikia,