Reference for Chullin 121:5

תני רבי חייא

R'Hiyya taught: A bird that has one characteristic [of cleanness] only, is clean,<span class="x" onmousemove="('comment',' A fortiori if it has more than one characteristic of cleanness; provided, however, it is not one of the other species of unclean birds specified in the Torah.');">⁴</span>

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