Pequeninos

In the science fiction series of Ender's Game, made by Orson Scott Card, two alien species were introduced: the Formics (AKA "Buggers") and the Pequeninos (AKA "piggies"). There could be no two dissimilar species. While the Buggers were far more advanced and great than the humans, the Piggies were like stone age humans. The Piggies were mammals, while the Buggers, obviously, are leaning toward insects.

(:Spoiler) After about 2,000 years after Ender destroyed the Bugger home planet,