Py·garg Py·gar·gus
  1. Zool. A quadruped, probably the addax, an antelope having a white rump.
  2. Zool. (a) The female of the hen harrier. (b) The sea eagle.
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  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.