Axolotl
(http://i38.tinypic.com/m9ygix.jpg)
The Axolotl, often called the 'Mexican walking fish' though it's really a salamander, is native to the ancient water channel system of Mexico City. It prefers deep brackish water with plenty of vegetation. The threats to the Axolotl's habitat date back the 17th century, when the city's water system began being neglected, drained and having sewage dumped in it. The main threat today is further degradation of this water system. Fortunately, the axolotl breeds well in captivity, perhaps allowing wild reintroduction at a later date, should its habitat be restored.