What does hexagonal dinosaur variation mean? ! ! !

That is, landing ... evolved into a salamander. The external gills degenerate and disappear, and the breathing lungs develop in the body. The toes are close to salamanders, which can change from aquatic to amphibious and crawl, but the limbs are not harmonious.

Mexican salamander is a famous "larval mature" species among amphibians (from birth to sexual maturity until spawning, it is in larval form). Larvae live and lay eggs in water all their lives.

Mexican salamanders don't evolve into salamanders in natural environment. If we want to force them to evolve, we must increase the content of iodine ions in water or add thyroid hormone to food.

Some Mexican salamanders have metamorphosis, but it is very rare, usually caused by injection of iodine or thyroid hormone. There is another way to make it abnormal, but there is little chance of success. Put the Mexican salamander into the shallow container of the artificial ecological park, and then slowly lower the water level, so that it is difficult to completely submerge the Mexican salamander's body until it can't completely submerge the Mexican salamander's body, so that it will stop breathing with its gills and switch to breathing with its lungs. After a few weeks, it will slowly turn into an adult salamander. During metamorphosis, the artificial ecological park must be kept moist, and clean water should be sprayed on the adult Mexican salamander in the form of spray. Mexico's blunt-mouthed salamander has little chance of successful metamorphosis by this means, and it will kill Mexico's blunt-mouthed salamander in most cases.

As we all know, natural transformation is very rare, but if you try to do it manually, you'd better leave it to a trained scientist. Failure to produce enough hormones is the cause of sexual maturity of larvae. Even if artificial metamorphosis succeeds, it will shorten the life span of Mexican salamander. Mexican salamander with mature larvae can generally live for 10 to 15 years (in Paris, individual cases have been recorded for 25 years), while the metamorphosed salamander can hardly live for 5 years. Its adult state is like a tiger salamander, which supports the theory that the two species are close relatives.