There seem to be exceptions to this, such as the reference made to Kzaargh-Commodore's harem in the novella "Catspaws" by Hal Colebatch (appearing in Man-Kzin Wars XI, 2005) despite his not having yet earned a full name.
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The Star Trek Logs, written by Alan Dean Foster, hint that the Caitians are an offshoot race of archaic Kzinti (where both genders are intelligent) who have renounced conquest.
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Manny Coto, who produced the final season of Star Trek: Enterprise, had made plans to include the Kzinti in an episode called "Kilkenny Cats", but the series was cancelled before this could occur.