Commentary for Chullin 114:47
אם כן במידי דמיטרפא בה הגדילה כנפיים האחרונים יותר מן הראשונים
It was taught: The test for a trefah is that it cannot bring forth young.<span class="x" onmousemove="('comment',' This does not mean to say that if it cannot bring forth young it is certainly trefah, for this may be due to various causes; but it means that if it does bring forth young it is certainly not trefah (Tosaf.) .');"><sup>15</sup></span>
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