is there any differences between mexican salamanders and other salamander species

Yes, Mexican salamanders (axolotls) have some distinct characteristics compared to other salamander species:

1. Neoteny: Axolotls are the most famous example of neoteny in vertebrates, meaning they retain their larval features throughout their life cycle. Most salamanders undergo metamorphosis, transitioning from aquatic gill-breathing larvae to land-dwelling adults with lungs.

2. Size: Axolotls are relatively large compared to many other salamander species. They can grow up to 18 inches (45 cm), whereas most salamanders are much smaller.

3. Gills: Adult axolotls retain their external gills, which are a feature typically given up during metamorphosis in other salamander species. These gills facilitate respiration in water.

4. Color Variation: Axolotals exhibit a wide range of natural color variations such as wild types with dark pigmentation and albino varieties, which are white or pink. Some mutations can produce golden or leucistic axolotls, which are less common.

5. Regenerative Abilities: Axolotls possess extraordinary regenerative capabilities, capable of regrowing entire limbs, parts of the spinal cord, heart, and other organs. This is a trait not commonly seen in other salamander species.

6. Lifespan: Axolotls typically have a longer lifespan than many salamanders, living up to 10-15 years under proper care, while the average lifespan for other salamander species can be much shorter.

7. Diet: In the wild, axolotls are carnivorous and eat a variety of small aquatic creatures such as worms, insects, and small fish. Many other salamander species have similar diets but may have slightly different dietary preferences.

8. Behavior: Axolotls are typically more active at night (nocturnal), like most salamanders, but their specific behaviors and requirements can vary.

Remember, there are many different salamander species, each with its own unique set of traits and adaptations. While axolotls stand out due to their neoteny and other features, all salamanders contribute to the incredible diversity of amphibians.