The axolotl, a neotenic species of salamander, a salamander that does not go through metamorphosis.
娃娃鱼，大鲵，蝾螈的一种，产自墨西哥。
By retaining its juvenile from, the axolotl can spend all its life within the safe confines of the water.
只有保持幼年形态，美西蝾螈才得以终生在安全的水域中生活。
There are several creatures in the animal world that refuse to grow up. The most outstanding is the axolotl.
动物界中也有几种不愿长大的生物，其中最有代表性的就是美西蝾螈。
It's also possible that the axolotl's mechanisms are different from other salamanders.
也可能美西螈的机理不同于其他种类的蝾螈。
In the wild, the axolotl is found only in Lake Xochimilco near Mexico City.
野生的美西蝾螈只有在墨西哥市的霍奇米尔科湖才能找到。
Then, in 1865, French scientists made an amazing discovery: the axolotl was in fact an immature salamander.
后来在1865年，法国科学家有了一个惊人的发现：美西蝾螈实际上就是未发育成熟的水蜥。
What is the reason for the Peter Pan behavior, and what makes the axolotl suddenly grow up?
是什么原因导致美西蝾螈像彼得·潘一样不愿长大，又是什么使它们突然成熟呢？
For years people were baffled by the axolotl.
很多年来，美西蝾螈一直令人感到困惑。
The latter gave rise to land vertebrates, some of which, such as the Mexican axolotl salamanders, retained electrosense ability.
后者是陆地脊柱动物的祖先，他们当中的一些还保持着探测电磁场的能力。
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