Pygarg

Boyd’s Bible Dictionary:

(white-rumped). A species of antelope (Deut. 14:5).

Concise Bible Dictionary:

This animal is only mentioned as clean for food (Deut. 14:5). The word pygarg signifies, as some think “white on its hind quarters,” which agrees with some of the antelopes; others think it is probably a gazelle, and others the addax, the Antilope addax.
Antilope Addax
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