Tc'a are native to Oh'a'o'o'o. Also live on N'i'i, V'n'n'u, Tt'a'va'o and Chchchah. Serpentine beings, leathery gold, methane-breathers. Have multi-partite brain that thinks in matrices and communicates in harmonics. The mouthparts are tool-using.
They can bulk a dozen times the weight of Mahendo'Sat and bear several young at once, without apparent interest to the process.
Sources: The Chanur novels,