As an aquatic species, the Selkath were skilled swimmers. They resembled anthropomorphic sting rays and had blue- or green-colored skin, which was patterned for underwater camouflage, and their mouths were bracketed by cephalic lobes. They tended to stroke these during conversation, analogous to the Human habit of stroking facial hair, such as mustaches.
All members of the Selkath race had retractable, venom-tipped claws. Similar to the Wookies, the use of these claws in any form of combat or attack was considered dishonorable and a sign of madness; to do this was to give in to animal instincts unbecoming of a sentient species. "
taken from Wookiepedia at: http://starwars.wikia.com/wiki/Selkath
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