The Mexican Axolotl is endangered due to city expansion infringing on their natural habitat, and this is quite a travesty.

Here are a few amazing facts about this adorable creature:
1) He never grows out of the larval phase of development (retaining his gills, fins and beady eyes), and breathes primarily through his gills and skin.
2) He has healing and regeneration abilities that scientists only wish they could decode and duplicate, making him an incredibly valuable subject of study.
3) He is neotenous, a.k.a evolutionarily backward, progressing from land to water in true punk rock defiance of nature.
4) Ironically, one of the most popular translations of the name connects the Axolotl to the god of deformations and death, Xolotl. But the most commonly accepted translation is “water-dog.”
5) He is rumored to have an exceedingly sweet disposition (of course! Just look at him!).
For further reading, I actually like this site better than the Wiki link.