it's a conservation success story that it's hoped could be repeated for other threatened habitats and species, including one that lives in just one lake in the north of mexico. the achoques, a close relative of the axolotl, was saved from extinction partly by a captive breeding program led by local nuns. open the mouth. and now, with the community helping to clean up the lake, here in patzcuaro, these captive—reared animals could be brought back to the wild. the success of the little tequila fish is a much—needed sign of hope for one of the many small and perhaps underappreciated creatures that are facing extension. amid a biodiversity crisis, it's a sign that, with people's help, nature can make a comeback. victoria gill, bbc news. don't forget you can get in touch with me and some of the team on twitter, i'm @benmboulos. there's plenty more on the stories we have covered and more on the