Reference for Chullin 117:55

אם פרסותיה סדוקות בידוע שהיא טהורה אם לאו בידוע שהיא טמאה ובלבד שיכיר חזיר

R'Hisda further said: If a man was walking in the desert and found an animal with its hoofs cut off and its mouth mutilated, he should examine its flesh; if it runs crosswise<span class="x" onmousemove="('comment',' I.e., the muscles at the rump under the tail run in a crisscross fashion, one series of muscles running downward and another running transversely. surg');">²¹</span>

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