cariacus columbianus

from The Collaborative International Dictionary of English v.0.48

Blacktail \Black"tail`\, n. [Black + tail.]
   1. (Zool.) A fish; the ruff or pope.
      [1913 Webster]

   2. (Zool.) The black-tailed deer ({Cervus Columbianus} or
      {Cariacus Columbianus}) of California and Oregon; also,
      the mule deer of the Rocky Mountains. See {Mule deer}.
      [1913 Webster]