System experience officer

Hydra is a genus of the family Hydrozoa in the order Gymnohydra. They are found in inland freshwater systems in Europe, Asia, America, and eastern Oceania. They can be found in almost all freshwater aquatic habitats such as ponds, lakes, slow-flowing rivers, and lakes up to 350 meters deep. They can also live in shallow, fast-flowing streams. Hydra usually attaches to underwater vegetation, stones, and other hard objects. They have low tolerance to pollution and are rarely found in polluted waters. They are also picky about temperature. When the water temperature is too cold, they will stop asexual reproduction and try sexual reproduction.

The appearance of hydra is similar to that of tiny and slender sea anemones, with a body length of about 30 mm, and some are between 1 and 2 cm, with radial symmetry. They come in a variety of colors, including gray, brown, brown, cream, green, orange, white, pink, and transparent. Their bodies are made of a thin, translucent gelatinous substance, only two layers of cells thick. Hydra has a columnar or trunk-like tubular body, closed at the bottom and open at the top, similar in structure to a bag. The mouth is located at the top of the body, which is a flexible tube. There are 4-25 long tentacles of varying lengths around the mouth. For example, the tentacles of green hydra are about 5 cm long when relaxed and can reach 20 cm when stretched.

Hydra has a strong regenerative ability and is the only animal that can fully regenerate. It can still regenerate after being cut into pieces. They have an inner cavity containing intestinal organs, and the endoderm covers the stomach cavity, producing enzymes that help digest food. Anything that is not digested will be discharged from the mouth. Respiration and excretion can also be discharged by diffusion throughout the epidermis. Common hydra has no heart, eyes, or gills, and has a simple nervous system. There is no brain or ganglion, but a sparse network of neurons in the body, and there is also a circle of nerve cells around the mouth.

Hydra can reproduce sexually and asexually. Its gelatinous body is highly retractable, and a sticky secretion on its "feet" allows it to cling to surfaces, glide slowly, or bend and roll slowly. Hydra is predatory, feeding on other small invertebrates such as crustaceans, worms, water fleas, shrimp, young fish and shellfish, and derives nutrition from the symbiotic algae that live on its body.

Earthworms, also known as earthworms and eels, are terrestrial invertebrates of the class Oligochaeta of the phylum Annelida, and are known as "ecosystem engineers". Earthworms are saprophytic animals with cylindrical bodies, bilaterally symmetrical, segmented, no bones, bare body surfaces, and no cuticle. They mainly feed on plant remains, organic debris, and soil containing organic matter or fungi. Earthworms are hermaphroditic and cross-fertilized. During reproduction, they produce egg cocoons through annular bands to reproduce the next generation. There are about 4000 species of earthworms in the world, the most widely distributed of which are Pheretima annularis, Eisenia fetida, Heterolipodium duratum, etc. The largest ones are 12 inches long. They are mainly distributed in Asia and South America.

After being dried, earthworms are cold in nature and salty in taste. They can be used to treat new high fever, epilepsy, convulsions and other symptoms. They have good effects of calming wind, stopping spasms and clearing away heat. After the earthworm is cut into two pieces, the part that lacks the tail will grow a new tail through differentiation, but only a very small number of the part that lacks the head can grow a new head. Therefore, if an earthworm is cut into two pieces, there is only a small chance that it will differentiate into two pieces, and a high chance that only one will survive or die. Because earthworms have lived underground for a long time, their heads have degenerated. Although earthworms do not have eyes, their tactile organs are very developed, including epidermal sensory organs, oral sensory organs, light sensory organs, etc., which can sensitively respond to objects and environments they come into contact with while moving forward.

There are obvious differences between earthworms and hydras in many aspects, mainly reflected in the following points:

1. Biological classification: earthworms belong to the phylum Annelida; hydra belong to the phylum Cnidaria.

2. Body structure: The body of an earthworm is composed of many similar segments and is long and cylindrical; the body of a hydra is cylindrical, usually with one end attached to objects such as aquatic plants and a mouth at the other end.

3. Symmetry: earthworms are bilaterally symmetrical; hydra are radially symmetrical.

4. Body cavity: Earthworms have a true body cavity; Hydra do not have a body cavity.

5. Nervous system: earthworms have a well-developed chain nervous system; hydra's nervous system is relatively simple, which is a reticular nervous system.

6. Reproduction method: Most earthworms are hermaphrodites, cross-fertilized, and mainly reproduce through sexual reproduction; hydra can reproduce sexually as well as asexually through budding reproduction.

Han Zifeng thought that since Huo's immortal worm had been found, the mandrill would also be online, but it was obvious that the ancient description and the modern description were not necessarily the same animal.

"In the south there is a giant from Gan, with a human face and long arms, a black body covered with hair, and heels turned back. When he sees someone laughing, he also laughs, covering his face with his lips, and then runs away."

"Xiaoyang country is to the west of Beiqu. Its people have long lips, black bodies and hair, and they walk backwards. They smile when they see people and hold a pipe in their left hand."

"If you get a person, smile first and then eat him."

"The owl sheep is good at eating people, with a big mouth. At first, it will smile with joy when it sees someone, but then it will cover its forehead with its lips and eat the person after a while."

The way people deal with it is to put a bamboo tube on their arm, wait for it to catch them, pull their hands out of the bamboo tube, and then use an awl to nail their lips to their foreheads, and then wait for an opportunity to capture them. There are several different speculations about the true identity of the mandrill: it is an unknown ape, the wild man in the legend of Shennongjia, an ancient cannibal tribe. Judging from the description that it looks like a human, has black skin and has the name of Xiaoyang, it is possible that it is Negrito, that is, pygmy black people. They may have lived a primitive life of half human and half beast in ancient times, with a brutal temperament, low level of civilization, and a barbaric custom of cannibalism. Large black bears will stand up and attack humans.

Zi Feng thought about it carefully. The mandrills she knew were mostly lonely ghosts that died in the mountains and cultivated into human form. Or they were mountain gods. But in the Classic of Mountains and Seas, they became monkeys or bears. Zi Feng simply used the real mandrills to deal with it. After all, they were monkeys, just a little uglier.

The point is that unicorns are hard to find, and with the otter's experience, why does she feel that it's just that humans cut off a monkey's foot, and then the monkey completely turned into a mandrill by chance? Who would eat humans for fun if they were spirits? They must be mentally ill.

Mandrill is a mammal of the genus Mandrill in the family Primates. Also known as the drill baboon, it is the largest primate in the world. It has a sturdy body, can reach 75 cm in length and weigh more than 50 catties.