Variant spelling of corsac; a small pale fox native to Central Asian steppes and deserts.
Alternate romanization of the Russian 'korsak,' with the same Turkic language origins as the standard 'corsac' spelling. Different sources use different transliterations from Cyrillic to Latin letters.
You'll see both 'corsac' and 'corsak' in older scientific literature because there wasn't a standard way to transliterate Russian animal names into English until the 20th century—naturalists just spelled it however made sense to them.
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