Reference for Chullin 41:29

א"ר שמואל בר יצחק

If their (0) heads have been cut off, even though their limbs move convulsively, they are unclean[the convulsions being] but similar to the convulsive movements of the lizard's tail [after it has been cut off].<span class="x" onmousemove="('comment',' These movements are clearly no signs of life, since the tail is here absolutely severed from the body.');">¹¹</span>

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