Reference for Chullin 123:1

היה בקי בהן ובשמותיהן עוף הבא בסימן אחד טהור

To one who is familiar with these birds<span class="x" onmousemove="('comment',' I.e., the peres and the 'ozniah. These are the only unclean birds that have only one characteristic of cleanness.');">¹</span>

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