Pequininos

From Orson Scott Card Wiki

(aka "piggies") - apparently sentient, although primitive life forms found on Lusitania. In order to compensate for Ender's xenocide, minimum human contact with the "piggies" was ordered in an attempt to control human influences on the pequenino culture. To that end, a wall was erected around the town of Milagre in order to insure that the "piggies" could not watch humans and inadvertently gain technology which would only serve to destroy their unique culture.