Yuuzhan Vong
The Yuuzhan Vong are a species humanoid sapients of extra-galactic origin in the Star Wars Expanded Universe. They are notable for launching an invasion of the Star Wars galaxy in 25 ABY.
Attributes
Externally, they resemble humans to a degree but are distinguished by their sloped foreheads, grey-and-yellow skin, and short noses.
Masochism is a common element throughout Yuuzhan Vong culture, and headscars are considered a symbol of rank in their society.
Yuzzhan Vong technology is biological.
Organization
Yuuzhan Vong society is highly religious and is divided into a number of castes -- including Warrior, Priest, Shaper (Genetic Engineer) and Intendant -- each with its own culture and its own gods.
Fan Reaction
In general, the fan reaction to the Yuuzhan Vong has been negative, largely because of biowank.
External Links
Yuuzhan Vong entry in the StarWars.com databank