T'ca are yellow, leathery, and snakelike in appearance. They have multiple eyes (and brains!) and are part of the seven-species Compact. Tc'a speech sounds like layered multitonal wails; single-brained species (like humans) almost always need technological assistance to communicate, and even then, messages read out as a seven-part matrix that can be interpreted in any direction. Another Compact member-species, the oxy-breathing stsho, appear to be able to communicate more directly.