Pygarg

Heb. dishon, "springing", (Deut. 14:5), one of the animals
permitted for food. It is supposed to be the Antelope addax. It
is described as "a large animal, over 3 1/2 feet high at the
shoulder, and, with its gently-twisted horns, 2 1/2 feet long.
Its colour is pure white, with the exception of a short black
mane, and a tinge of tawny on the shoulders and back.",
Tristram's Natural History.