Pierson's Puppeteers - Wikipedia

What are the most interesting fictional species, either for sci-fi or fantasy? - Quora

Pierson's Puppeteer, Larry Niven Wiki

Pierson's Puppeteer, Alien Species

Novels by Larry Niven (Book Guide): Ringworld, Known Space, the Mote in God's Eye, the Legacy of Heorot, Beowulf's Children, Footfall by Books LLC

Pierson's Puppeteer, Alien Species

Pierson's puppeteers, strange, three-legged, two-headed aliens, have discovered an immense structure in a hitherto unexplored part of the universe.

Ringworld

Kate Pierson Muppet, Muppet Wiki

Monster Cruise Activities Brochure, page 2 by KTurtle -- Fur Affinity [dot] net

Pierson's Puppeteer, Memory Beta, non-canon Star Trek Wiki