Reference 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.) .');">¹⁵</span>

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