While scientists could once find 6,000 axolotls on average per square kilometer in Mexico, there are now only 36, according to the National Autonomous University's latest census. Despite the creature's recent rise to popularity, almost all 18 species of axolotl in Mexico remain critically endangered, threatened by encroaching water pollution, a deadly amphibian fungus, and non-native rainbow trout. ![]() ![]() "We lack big monitoring of all the streams in Mexico City," let alone the whole country, said Calzada, who leads a team of nine researchers. Still, there aren't enough resources for thorough research, said Alejandro Calzada, an ecologist surveying less well-known species of axolotls for the government's environment department. Last year's Adoptaxolotl campaign raised just over $26,000 toward an experimental captive breeding program and efforts to restore habitats in the ancient Aztec canals of Xochimilco, a southern borough of Mexico City.
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