Common Pets – Six-Horned Axolotl
The Mexican Axolotl (Ambystoma mexicanum), also known as the 'walking fish', is a type of salamander, notable for its unique appearance and neoteny (retention of larval features throughout adulthood). It is found globally and is kept as a pet (particularly in North America), exhibiting rib-like grooves, a laterally compressed tail, a broad head, and small eyes, with limited mobility. The salamander has a slender and dark-colored body with dark brown markings and black spots, short legs with four digits on the forelimbs and five digits on the hind limbs. Artificial breeding has produced albino, white-mutant, and other colored mutant specimens. Limbs and tails are small but the tail is long.
Wild specimens typically inhabit moist environments, burrowing and returning to streams only during the breeding season to lay eggs. They feed on crustaceans, mollusks, small fish, tadpoles, and young frogs. They have poor vision, relying primarily on smell or lateral lines for predation. Limbs and tails can regenerate. It is a species endemic to Mexico.
The Mexican Axolotl is the largest member of the tiger salamander family, with specimens reaching over 43 cm in length, but typical adults range from 20-28 cm, with males weighing 125-130g and females weighing 170-180g. This species exhibits complete neoteny, with some larvae retaining functions into adulthood (gills, skin larval morphology, tail with two ends, etc.). The head is broad and small eyes. Rib-like grooves are present. They burrow and are difficult to move, undergo complete metamorphosis, and retain external gills throughout their lives, with slender, weak limbs and a relatively thick tail. The skin is smooth and scaleless, with a thin, regularly shed epidermis. They have no tympanic membranes or eardrums; the tongue is oval and does not fully protrude to take food; there are fine teeth around the jaws; and males have no claspers. During courtship, glands or cloacal glands secrete special gases to identify conspecifics. Juvenile salamanders are aquatic and lay eggs. They have 3 pairs of larval filaments, and metamorphosis begins after 2-3 ages, with the disappearance of the gills, closure of the gill slits, and the formation of the cervical folds.
The salamander has a slender and dark-colored body with dark brown markings and black spots, short legs with four digits on the forelimbs and five digits on the hind limbs. Artificial breeding has produced albino, white-mutant, and other colored mutant specimens. Limbs and tails are small but the tail is long. The dorsal fin extends posteriorly from the head to the tail, and the ventral fin extends from the middle of the hind limbs to the tail. Salamanders may lose external gills in the laboratory, resembling tiger salamander adults.
The Mexican Axolotl is an amphibian that is often referred to as the 'animal of Peter Pan'. It is a well-known amphibian species for neoteny (from birth to sexual maturity, it remains in a larval state). It remains in a larval stage throughout its life, which explains why it has larval gills and eyes without eyelids. In addition, it has a remarkable regenerative capacity. Limbs and tails can regenerate. A Mexican axolotl can regenerate a limb or part of the spinal cord and brain. The average lifespan is 10-15 years.
Juvenile salamanders live and lay eggs in the water. They have been kept for over 100 years, primarily as live specimens for endocrine experiments, so research into their breeding and rearing has essentially been established. Today, they can barely be seen in the wild, only in some aquariums.
Most species of salamanders are predominantly terrestrial, burrowing into soil burrows. The Mexican Axolotl is a well-known amphibian species for neoteny (from birth to sexual maturity, it remains in a larval state). They live and lay eggs in the water, and they have been kept for over 100 years, primarily as live specimens for endocrine experiments, so research into their breeding and rearing has essentially been established. The sexual maturity age is 12 to 18 months, and female reproductive capacity can lay up to 400 eggs per season, with an average of 175-200 eggs.
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