Halakhah su Giobbe 39:5

The Gemara continues with the description of another criterion by means of which an animal may be recognized as a member of a permitted species: "If a man was walking in a desert and found an animal with its hoofs cut off and its mouth mutilated, he should examine its flank; if it runs crosswise he may be certain that it is clean, but if not he may be certain that it is unclean; provided, however, he recognizes the arod….²³Although the term arod is rendered as “wild ass” in the King James translation of Job 39:5, the identity of this animal cannot be determined with any degree of certainty. Where should he examine the flesh? … Under the rump." In kosher species the flesh under the tail in the vicinity of the rump runs in a criss-cross fashion; one series of muscles runs downward so that that portion of the meat is readily torn vertically and another series of muscles runs transversely so that that portion of the meat is readily torn horizontally. The Gemara explicitly states that we are the recipients of a tradition received by Moses at Mount Sinai to the effect that the arod is the sole non-kosher animal manifesting this characteristic. Thus, if the babirusa indeed manifests this characteristic there would be yet additional grounds for assuming that it is a kosher species.