From Holocron - Star Wars Combine
|Average Height||1.7 – 3.0 meters |
|Skin color||Gray |
|Distinctions||Stocky build, large heads, long snouts, long arms, three fingered hands, three toed feet |
|Known Members||List of known Chevin|
Biology and Appearance
The Chevin have thick, wrinkeled gray skin that provides a thick hide of protection, and the ability to regulate their body temperature. The Chevin stand around 2.5 meters on two thick legs that support their bulky frames. They have large heads, which support a trunk that stretches down to the ground. This trunk allows the Chevin to forage for food while watching for predators.
The Chevin evolved from smaller relatives of the giant mammals who were wiped out when an asteroid collided with Vinsoth millions of years before the time of the Galactic Republic. Chevin had long snouts which hung down nearly to their ankles. Combined with their intellect, this made them skilled hunters of animals such as backshin, because they could smell out their prey or feed while keeping their eyes on the horizon. It was also their hunting prowess which allowed them to dominate their homeworld and conquer the Chevs. Chevin had thick legs, massive wide bodies, thin rope-like tails, and arms so long their three-fingered hands often brushed the ground. 
Despite their ungainly appearance, they could walk or run almost as fast as more nimble-looking humanoids. Chevin boasted a double set of eyelids, one of which was transparent to prevent dust and wind from interfering with their vision. Their thick gray skin and efficient circulatory system kept them cool in warm climates and warm in cold climates, though they preferred semi-tropical conditions. The traditional Chevin costume consisted of long, elaborately patterned robes (though they did not wear clothing until they were contacted by other species) and jewelry. One Chevin even possessed the ability to kill a human with just his forehead. 
Society and Culture
Despite their appearance, the Chevin are a technologically advanced, carnivorous species belonging to the pachydermal family. The species originated on Vinsoth, a world of rolling plains, with arctic polar regions, and few deserts. Their culture has forged the species into a greedy one. Chevins are infamous for their lust for money, power, and status. They will accomplish their goals by any means necessary. The Galaxy has come to see Chevin as gamblers, smugglers, blackmailers, and gun runners. They are also notorious as slavers for manipulating the humanoid race of Vinsoth, the Chevin. Although the Chevin are capable of using weapons of destruction, they tend to let others do their dirty work, or just force their slaves to do it for them. Though technologically advanced, the Chevin did not research their technology. They acquired it from an unknown offworld source, and adapted it to their lifestyle and needs. As a migratory species, the Chevin once walked the plains of Vinsoth. Now with technology, most travel the world on large community platforms, similar to the Ithorians and their herdships. The destitute Chevin tend to employ ground vehicles with wheels, rather than the repulsorlifts that wealthier Chevin put to use. While the Chevin travel on the platforms, the slaves walk and are expected to keep up.
Beginning as simple hunters and gatherers, the Chevin went on to conquer the Chev settlements and extend their nomadic civilization to dominate their homeworld. Vinsoth was rich in food and plant cover, and was eventually visited by offworlders seeking covert bases and food supplies. The Chevin soon gained galactic-level technology through trade, eventually manufacturing their own sophisticated weapons and vehicles. Though their technology was mostly acquired from offworld sources, they reverse-engineered products like starships in order to produce their own designs. Chevin starships were noted for their spacious cargo bays, roomy cabins, and large crews. Most of their technical advances went towards keeping their slaves in line and ensuring the continued domination of their homeworld. Chevin wore clothes only because other species did.
Chevin lived in small, mobile communities, with homes mounted on great wheeled carts. Even after they gained access to galactic technology, they continued to live as nomads (though more affulent Chevin mounted their lodges on large repulsorlift vehicles instead.) Their Chev slaves were usually forced to follow on foot. Nomadic groups of Chevin kept in touch via comlinks, and often converged on a single location to deal with danger.
The only Chevin settlements which stayed in place for more than one standard month were the "Government Villages", where Chevin dictators lived with their hand-picked advisors. Even these settlements were movable when necessary. Each of the roughly two dozen Government Villages ruled a Chevin nation.
These nations rarely warred against each other, beyond the occasional border skirmish, though economic competition was fierce. Warrior-politicians who won their positions through single combat roved from camp to camp, providing information to Chevin dictators.
The Chevin saw themselves as opportunistic realists interested in self-safety. Their culture valued the acquistion of power, wealth, and status by any means necessary. Most Chevin preferred to meet their goals through intrigue and subterfuge, letting others fight for them when necessary. They were calm and even-tempered if treated with respect, but quick to become bullies if angered, or retaliate if slighted or cheated. 
References:  - http://starwars.wikia.com/wiki/Chevin