Source : Webster's Revised Unabridged Dictionary (1913)

Chief hare \Chief" hare`\ (Zo["o]l.)
   A small rodent ({Lagamys princeps}) inhabiting the summits of
   the Rocky Mountains; -- also called {crying hare}, {calling
   hare}, {cony}, {American pika}, and {little chief hare}.

   Note: It is not a true hare or rabbit, but belongs to the
         curious family {Lagomyid[ae]}.