Because of their strength and intelligence, many scientists believed the Yuzzem to be distant relatives of the Wookiees.
During the Separatist Crisis preceding the Clone Wars, at least two Yuzzem guards were in employ of Bossban Soergg Vosadii Bezhin who had strong ties with the Separatists. Afterward, the Confederacy of Independent Systems used them to fight on Aargonar. The Galactic Empire enslaved the species as they had done to the Wookiees and were employed for heavy labor such as mining. However, because of their strength and their ill-temperament, the Imperials had trouble making them work as slaves. The species also had long hangovers due to their massive size.
During their adventures on Mimban searching for the Kaiburr crystal, Luke Skywalker and Princess Leia Organa were helped by two Yuzzem, Hin and Kee. Both were slain by Darth Vader.
In 44 ABY, a Yuzzem Jedi Master, Barratk'l, joined the Jedi High Council.
- A Guide to the Star Wars Universe
- A Guide to the Star Wars Universe, Second Edition, Revised and Expanded
- The Essential Guide to Alien Species
- "Callsigns: Names of Kashyyyk" — Star Wars Gamer 10
- Coruscant and the Core Worlds
- Ultimate Alien Anthology
- The Official Star Wars Fact File117
- The Complete Star Wars Encyclopedia
- Galaxy at War
- "Legendary Authors: Alan Dean Foster" — Star Wars Insider 156