Wikipedia
Formics
The Formics, also known as Buggers, are a fictional insect-like alien species from the Ender's Game series of science fiction novels by Orson Scott Card.
According to the novel canon, the Formics attacked Earth a few generations before the novel begins. They attempted to colonise the planet and were barely fought off by an Earth soldier known as Mazer Rackham. The first book in the series, Ender's Game, largely stems from the human quest to defend themselves from this species, although the Formics ultimately turn out as victims, with the first attack being an accident due to differing biology.