Reference for Chullin 117:43

וכדרב חסדא דאמר רב חסדא

And this accords with R'Hisda's statement, for R'Hisda said: If a man was walking in the desert and found an animal with its hoofs cut off, he should examine its mouth; if it has no upper teeth he may be certain that it is clean, otherwise he may be certain that it is unclean; provided, however, he recognizes the camel.

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