Having seen a documentary about what the Mexicans have done to the axolotl's habitat, how they have reduced it from two large lakes to just one system of grubby canals, into which they allow the flow of sewage and chemical products, if there is to be an axolotl sanctuary area set up, it should not be in Mexico.
The Mexicans and their government have had the chance to look after an critically endangered species. They could have taken steps to protect its habitat, but nothing was done, because Central American governments care nothing for the environment, on the whole. Saving axolotls would make them no money.
The Mexicans no longer deserve to be the guardians of the axolotl in the wild. They have wilfully pushed it to the brink of extinction, like someone with liver damage continuing to slug down whisky. They had their chance and they blew it.