Reference for Chullin 75:7
אמר רב ענן לדידי מפרשא לי מיניה דמר שמואל
We have learnt it [already]: IF A SMALL ANIMAL STRETCHED OUT ITS FORELEG [AT THE END OF THE SLAUGHTERING] BUT DID NOT WITHDRAW IT, IT IS INVALID, FOR THIS WAS BUT AN INDICATION OF THE EXPIRATION OF ITS LIFE.
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