Are the kosher signs of wild animals Biblical?

Note: This is the work of one evening, rather than something thought out over months. There are likely sources of which I am embarrassingly unaware. I haven't looked at other gemaras to see if this works out consistently, or at midreshei halacha such as Sifra, and so on. Rather, this is a way of playing with the text, on the basis of a discovered variant text, and of illustrating a process and approach. So this likely requires more thought, and certainly should not be the basis for any changes in practice.
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