Reference for Chullin 122:4

השתא דאית ליה תרי לא אכלינן דאית ליה חד מיבעיא

Surely if we may not eat those that have two [characteristics of cleanness] it goes without saying [that we may not eat] those that have only one [characteristic]! Then let us infer [the rule] from the peres and the 'ozniah! - If so, why does the Divine Law specify the eagle?

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