11. The genetics of the color variants of the axolotl have also been widely studied. 12. Climate change has also immensely affected axolotls and their populations throughout the southern Mexico area. 13. The axolotl is therefore used as a model for the development of limbs in vertebrates. 14. A single typical axolotl typically requires a tank with a water depth of at least. 15. Paedomorphosis can be observed in the axolotl . 16. Patzcuaro salamanders have been hybridized with axolotls , and used in mitochondrial studies for comparison. 17. Axolotl was featured in a main article in the August 2007 issue of The Wire.18. Tilapia and carp directly compete with axolotls by consuming their eggs, larvae, and juveniles. 19. ,wild axolotls were near extinction due to urbanization in Mexico City and consequent water pollution. 20. Axolotls can also eat feeder fish, but care should be taken as fish may contain parasites
