Axolotls (Ambystoma mexicanum) are a critically endangered species of salamander. The species has only one natural habitat remaining, a series of canals in Mexico City, and only 50 to 1,000 axolotls ...

This article was originally featured on Undark. On the southern edge of Mexico City, on a patch of land surrounded by water, a farmer and a scientist recently inspected rows of small cubes of mud that ...