Reference for Chullin 104:37

וכי תימא

An objection was raised: The clawing by a cat or a hawk or a marten [does not render trefah] unless the claw actually penetrated into [the abdominal] cavity.<span class="x" onmousemove="('comment',' And pierced an internal organ. Accordingly the claw is on a par with a thorn or a needle, but it does render trefah solely by the clawing and the poisonous discharge that follows.');">¹⁷</span>

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