From Holocron - Star Wars Combine
|Language||Bothese (spoken), Botha (written) |
|Average Height||1.4 to 1.5 meters |
|Distinctions||Mood-sensitive fur, canine, feline, and equine features and facial appearances |
|Known Members||List of known Bothans|
Biology and Appearance
Bothans are humanoid aliens and are covered with fur that ripples in response to their emotional state, when excited it is common for them to shed profusely. They have tapered ears and both males and females sport beards. They average 1.6 meters and live slightly longer than humans. Their native planet of Bothawui is a lush planet with cities and vegetation in peaceful coexistence.
Society and Culture
Bothans are masters of deception and spying. Their spy networks rival those of the Empire and the Rebel Alliance. They are also outspoken for their beliefs, and are often in political positions. They are also very loyal, and take pride in their loyalty to various Bothan clans. It is documented in the City Hall of the capital city that there are 608 Bothan clans.
Bothans were furry mammalian anthropoids, about 1.5 meters tall. Hailing from Bothawui and several colonies, Bothans differed in facial appearance and body structure with canine, feline, and equine features. They were known for being master politicians and spies, craving intrigue and subterfuge. 
Through numerous conflicts, the Bothans remained officially neutral, although their famed Spynet always played each side and commercial interests sought profits. 
Bothan culture was guided by the philosophy and principles set forth in the ancient text known as the The Way, written by Golm Fervse'dra. In this "Bothan Way", the pursuit of power and influence was paramount. Thus, individual Bothans put their own political and economic success above all other concerns, and as a species, Bothans put their own advancement ahead of other intergalactic interests. The volume of backstabbing, subtle character assassination and political maneuvering in Bothan society was dizzying, and resulted in many species stereotyping Bothans as untrustworthy.
In times of crisis, the focus of Bothan society shifted to a survivalist state known as "ar'krai". When engaged in ar'krai, all fit Bothans volunteered to defend their species from impending annihilation. 
Immediate Bothan families were organized into large clans, which were the most important social unit in Bothan society; family and clan loyalty were equally important as power accumulation. Clan association was denoted as the last component in a Bothan name. For example, the name Girov Dza'tey would mean that Girov was his given name, Dza his family name, and that he was of the Atey clan. 
References:  - http://starwars.wikia.com/wiki/Bothan