In "Protector", we learn that humans are descended from the Pak. Accordingly, most of the positive attributes of Protectors are based on negative human aging effects: sore joints, poor circulation, wrinkled skin, lack of sex drive, and tooth loss are all turned to advantage during the shift from Breeder to Protector. Niven has written that he invented the Protectors as a thought experiment to explain the common effects of aging on humans, and to create a fictional evolutionary explanation for humans' long lives after females have passed reproductive age. The Pak also appear in several of Niven's later novels, notably those set in the Ringworld. The Pak first appeared in "The Adults," which appeared in "Galaxy" in 1967 this story was expanded into the novel "Protector" by Larry Niven (1973).
Pak Breeders and Pak Protectors are two forms of fictional life in Larry Niven's Known Space universe.
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