Reference for Chullin 122:5

וניגמר מפרס ועזניה

For if we may not eat those that have one [characteristic of cleanness] it goes without saying that we may not eat those that have none [of the characteristics of cleanness]! The inference must therefore be: You may not eat the eagle because it has none [of the characteristics of cleanness], but whatsoever has one [characteristic] you may eat.

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