Reference for Chullin 280:17

תיקו

It follows, does it not, that if a clean [bird was sitting upon the eggs of another] clean bird, one is bound to let it go? - Perhaps this is so only with a hen partridge.<span class="x" onmousemove="('comment',' I.e., the inference which Abaye makes from the statement of the Mishnah, that where one clean bird sits upon the eggs of another clean bird the law applies, may be restricted only to the case of the hen partridge which habitually broods over other birds' eggs.');">¹⁰</span>

Rashi on Deuteronomy

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