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The axolotl can grow up to 12 inches and weigh anywhere from three to eight pounds, and its average lifespan in the wild is 10-15 years. Most axolotls are dark brown with some black speckling, but ...
A captive leucistic axolotl, perhaps the most well known form of the axolotl Face of a common or wild type axolotl The speckled wild type form Axolotl's gills (Ambystoma mexicanum) A sexually mature adult axolotl, at age 18–27 months, ranges in length from 15 to 45 cm (6 to 18 in), although a size close to 23 cm (9 in) is most common and ...
External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animal's head. The axolotl has three pairs of external ...
The axolotl continues to thrive in captivity though and is highly regarded by scientists studying regeneration. That's because the amphibian can regenerate brains, jaws and even spines without ...
Axolotls retain gills and fins as adults; these are juvenile features in most amphibians. Paedomorphosis can be the result of neoteny , the retention of juvenile traits into the adult form as a result of retardation of somatic development, or of progenesis, the acceleration of developmental processes such that the juvenile form becomes a ...
The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers . Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum.
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Alligators can regrow their tails, it turns out. Researchers have discovered that these ancient reptiles that date back to dinosaur days and can grow 14 feet long or more can regenerate themselves ...