From The Collaborative International Dictionary of English v.0.48 :
Mara \Ma"ra\, n. (Zool.)
The Patagonian cavy, a hare-like rodent ({Dolichotis
patagonum or Dolichotis Patagonicus) of the pampas of
Argentina.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
Dolichotis patagonum
n 1: hare-like rodent of the pampas of Argentina [syn: mara,
Dolichotis patagonum]