The Coyerti were extremely resistant to Imperial occupation, and held their own against the stronger force for a long time. However, due to their complex biology they were rendered extremely vulnerable during their reproductive season, a weakness the Imperials were sure to exploit. In preparation for this, the Rebel Alliance's high command was contacted, and the Alliance's 61st Mobile Infantry was sent. The 61st, also known as Twilight Company, succeeded in destroying the Imperial biotoxin facilities and defending the Coyerti through their reproductive season.
The Coyerti species appeared in the 2015 novel Battlefront: Twilight Company, written by Alexander Freed.