Among the most famous cave dwelling animals is a salamander genus called "cave salamander" or "blind salamander". They inhabit the darker parts of the groundwater, mostly in caves with slow-flowing springs. When the water is shallow, the hagfish are often trapped in the mud, but they prefer living water. When the water rises, the blind salamander is often washed out of the hole to the light, but they cannot enjoy the light, so the name has a "blind" word.
<h1 class= "pgc-h-arrow-right" > animals living in the dark</h1>
The hawkfish was first recorded in 1761 and came from Lake Kikonidze. When people first see this species, they think it is a dragon cub, because its appearance is indeed somewhat similar to the image of the dragon we think. The cave salamander is less than 30 cm long, but there are some individuals that can reach 40 cm in length, like water lizards, covered with smooth flesh-colored skin, sometimes with slightly speckled marks, but the most prominent color is under the three pairs of gills, which clearly reflect the red color of blood. These gills are often branched or clustered. The head is long and blunt at the front, slightly resembling the head of a barracuda. The legs of the hawks are weak, and in the degeneration they are not strong enough or long enough to support the body. The front pair has three fingers and the back pair has only two toes. When swimming, the tail fluctuates to the side. The tail is flattened, the opposite of a cylindrical body. The representative of this animal cave dweller is a real cave creature that does not live in a place where there is sunlight. Its whole life has been at night, and its eyes have deteriorated severely, and it faces endless darkness every day.
<h1 class= "pgc-h-arrow-right" > little-known habits of life</h1>
It is said that the cave salamander can live for more than 100 years, but it has not been confirmed so far, because it is very difficult to investigate the cave salamander in the natural environment, its habitat is difficult for humans to enter, and it is not convenient to make zoological observations in the black hole, so the life habits of the blind salamander are rarely known. Fortunately, this animal can still withstand captivity and can catch some and come back for observation. They are most likely to flourish in water with low and constant temperatures. When reared, they eat a variety of water fleas and small aquatic worms, such as frilling worms, and they are also able to catch some small crustaceans. They are blind, but they can find strands of raw flesh in the water to tease them.
In the early spring, the tail margin of the male blind salamander tends to be higher, while the female blind salamander becomes fatter than usual, reflecting the eggs under the semi-transparent skin. After spawning, the eggs stick to the stones that protrude from the water. Each female can lay a total of 12-56 eggs. The method of fertilization has yet to be studied, but it must be in vivo, unlike frog eggs that are fertilized in vitro after birth. There is another sleeve on the outside of the egg, which is wrapped in transparent glue on the outside, like a frog egg, and their eggs hatch after about 90 days, and the juvenile fish are almost an inch long. Similar and small compared to their parents, with few differences. There is a thin, unpaired fin that starts from the back of the body and continues to the periphery of the tail. The short hind legs don't even have two toes. The eyes, however, are distinctly reflected under the skin and become black spots. Embryos develop in the dark without color, but if the newly hatched larvae are taken to the bright place for study, many fine brown dots will soon grow.
Hagfish are oviparous animals, british scientist Dr. Kameler in the Vienna laboratory in a very suitable place to raise some hazard salamanders, in the ground 16 feet below the deep hole, often give them some cold water. In this case, the blind breeding salamander does not lay eggs, but gives birth to live pups. Many scientists tend to prefer that they are viviparous, not oviparous. Egg laying is not the usual method of reproduction for hagfish, but a stopgap measure chosen in an environment lacking cold water. Although we are not very sure how all species of hagfish reproduce, the vast majority of species in cave dwelling are viviparous. The female brachycephaly floats on the surface of the water when she gives birth to live pups, bending the body two sections down. The production period is usually in October. If the few previous observations were sufficient as evidence, we can say that viviparity is the most economical method of reproduction. Because only two pups are usually born, the shorter the animal's infancy, the smaller the chance of death, and the smaller and safer the family.
<h1 class= "pgc-h-arrow-right" > the genetics and evolution of hagfish</h1>
The hagfish is almost colorless in black holes, but it has no genetic factor in losing its color. Because as soon as it arrives in a light laboratory, it quickly becomes striated. Its skin is as good at light as it is in photos, and after a few months, it can turn very dark. If you put it back into the dark, it slowly loses its color. If you move the whitened specimen to the bright spot, it turns black again. Light is the external "environmental" factor, which exhibits the internal color transmission factor, which is still part of the genetic nature.
By looking at fossil bones and paleontology, we can find that the eyes of the hagfish were very developed at first, but they degenerated halfway, and it was hidden deep under the thick skin and gradually disappeared. But scientists have shown through research that if the new young hawthorn grows in red light, the eyes will develop to see things. After 5 years of red light, or white light and then given red light according to time, the eyes of the blind salamander will show a transparent cornea, iris, large crystals, and a retina with rods and cones. Maybe it still has a hole card when it evolves, ready to let itself go back into the light.
Magical nature has bred many amazing species, and we still have a long way to go from discovery to understanding...
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