axolotl

from WordNet (r) 3.0 (2006)

axolotl
    n 1: larval salamander of mountain lakes of Mexico that usually
         lives without metamorphosing [syn: {axolotl}, {mud puppy},
         {Ambystoma mexicanum}]

from The Collaborative International Dictionary of English v.0.48

Axolotl \Ax"o*lotl\, n. [The native name.] (Zool.)
   An amphibian of the salamander tribe found in the elevated
   lakes of Mexico; the siredon.
   [1913 Webster]

   Note: When it breeds in captivity the young develop into true
         salamanders of the genus {Amblystoma}. This also occurs
         naturally under favorable conditions, in its native
         localities; although it commonly lives and breeds in a
         larval state, with persistent external gills. See
         {Siredon}.
         [1913 Webster]