Mahabharata 12.181.9
जङ्गमानामसंख्येयाः स्थावराणां च जातयःतेषां विविधवर्णानां कुतो वर्णविनिश्चयः
jaṅgamānāmasaṃkhyeyāḥ sthāvarāṇāṃ ca jātayaḥteṣāṃ vividhavarṇānāṃ kuto varṇaviniścayaḥ
Our plain-language meaning of this verse is waiting for scholar review.
Open in the book