In many descriptions of Russian/Caucasus natural parks, e,g,
among MANY, mention is made of bos urus.
I suspect that it stems from promotional zeal as well as a Russian/East
European tradition of translating European Bison=wisent as aurochs, which
looked up in a dictionary, renders as bos urus.
Thank you for an insight or source about it.
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See also History of the Aurochs http://www.stavacademy.co.uk/mimir/aurochs.htm