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.
Name
The term "Formic" is derived from formica, the Latin word for ant; whereas "bugger" is a pejorative used by humans; yet it was not until 1999's Ender's Shadow that the term 'Formic' was first used, interchangeably with 'Bugger'. Later books used 'Formic' almost exclusively, as the more 'scientific' term. This leads to odd scenarios in the continuity of the books, such as Valentine referring to them as "Buggers" in Ender's Game, chronologically next as "Formics" in Ender in Exile, and again as "Buggers" in Speaker for the Dead and Xenocide. The feature film adaptation of Ender's Game uses "Formics" exclusively.
“What’s that Winston Churchill saying?” he said brightly as he walked away. “Keep buggering on.” ... To that, he can now add an unexpected hospital admission ... .
Two poorly placed cacti more than 50 years ago have turned into a full-scale invasion. It's prompting calls for people to dispose of their cacti safely to avoid a very prickly problem ... .