On the outskirts of Mexico City, biologists are working to reintroduce a treasured amphibian to the wild. But first they must revive an ancient method of farming. Credit... Supported by By Jennie Erin ...

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Despite their never-ceasing grins, axolotls have been at risk of extinction for years. Over two decades ago, there were about 6,000 of these tiny salamanders for every square kilometer in Lake ...

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