A white rhinoceros mother and calf are eating grass. Tim|u Booth | Shutterstock)

Rhinoceros is a large herbivore, which is identified by its unique horned kiss. The word rhinoceros comes from the Greek words rhinoceros (nose) and rhinoceros (horn). There are 5 species and 11 subspecies of rhinoceros, some with 2 horns and some with 1 horn. Because rhinoceros horns are used to treat diseases in folk medicine, rhinoceros are almost hunted. Their horns are sometimes sold as trophies or decorations, but more often they are crushed and used in traditional Chinese medicine. According to the International Rhino Foundation, rhinoceros horn is a powerful hangover cure for fever, rheumatism, gout and other diseases. It is usually made by adding rhinoceros horn powder to food or brewing in tea. The "protected state" KDSP "Save the rhinoceros" is estimated to have 5 rhinoceroses. At the beginning of the 2th century, there were 1, rhinoceroses in Africa and Asia. The organization said that there are now 29, wild rhinos. Poaching and habitat loss put all rhinoceros species in danger of extinction. [Related report: 213 was a record year for rhinoceros poaching in South Africa]

According to the Red List of Endangered Species of the International Union for Conservation of Nature, a black rhinoceros corpse with its horn cut off. Black rhinoceros, Sumatran rhinoceros and Javanese rhinoceros are "extremely endangered", which is the highest risk species on the list. There are 555 black rhinos, less than 1 Sumatran rhinos and only 35 to 44 Javanese rhinos. Related reports: Javanese rhinoceros is officially extinct in Vietnam. The one-horned rhinoceros is "vulnerable", which means that unless the environment improves, they may be on the verge of extinction. Fortunately, their number is increasing; There are 3333 larger rhinoceros with one horn in the world. According to the data of IUCN, the total population in 27 was estimated to be 2,575. White rhinos are "endangered", which means that they may be considered threatened with extinction in the near future. The number of white rhinoceros in the south is increasing; * * * There are 2,45 southern white rhinos. However, the northern white rhinoceros is considered "extinct" in the wild. According to the World Conservation Union, in 29, four northern white rhinoceros were moved from a zoo in Czech Republic and China to a private reserve in Kenya, hoping that they could breed. On October 18th, 214, the Ol Pejeta Conservation Society announced that one of them, one of the last two breeding males, had died. However, he was not a victim of poaching, and the Conservation Society is investigating the cause of death. On March 2, 218, the Conservation Society announced the death of the last male northern white rhinoceros in Sudan.

according to the statistics of the world widlife Fund, there are only two northern white rhinos left in the world, both of which are captive animals. The captured northern white rhinoceros are two females-Najin, the daughter of Sudan, and Fatu, the daughter of Najin-who live in Ol Pejeta Nature Reserve in Kenya. According to experts, these two women can't conceive successfully: Nagin is too old and her leg problems make her unable to support the increasing male weight; Fatu suffers from uterine diseases, which may make her infertile.

With the failure of natural reproduction of northern white rhinoceros, conservationists turned to in vitro fertilization. However, in vitro fertilization of these rhinos also faces a series of challenges, including how to make immature eggs develop in vitro in females and how to inject * * * into these eggs.

For Sumatran rhinos, they are also a thread hanging on it. Like the Javanese rhinoceros, the Sumatran rhinoceros hardly survived in the wild. According to the International Rhino Foundation, it was extinct in Vietnam in 21 and Malaysia in 215. There are a few subspecies in three national parks in Sumatra. In March 216, conservationists captured a Sumatran rhinoceros in the Indonesian part of Island B for the first time. Although a camera image taken in 213 showed that Sumatran rhinoceros did survive in this area called Kalimantan, the capture of this female rhinoceros marked the first physical contact with Sumatran rhinoceros in 4 years. Rhinoceros horn

Rhinoceros horn is composed of keratin, which is also a key component of human hair nails. But horns are more than just thick hair. CT scan showed that there were a lot of calcium and melanin deposits in the core of the horn. Scientists at Ohio University say that calcium makes horns stronger, and melanin protects them from the sun's ultraviolet rays.

horns are similar to horseshoes, turtle beaks and cockatoo beaks, said Tobin Heronimos, a doctoral student at OU. Rhinoceros horns tend to bend backwards towards the head because the front keratin grows faster than the back keratin, Hieronymus told Life Science. According to the San Diego Zoo, the outside of the horn is quite soft and can be worn out or sharpened after years of use. If the horn is broken, it can grow back gradually.

Black rhinoceros, white rhinoceros and Sumatran rhinoceros have two horns. Java rhinoceros and big one-horned rhinoceros have one. According to the International rhino Foundation, the front horn of a black rhinoceros can be 2 to 51 inches (51 to 13 centimeters) long, and the back horn can be about 2 inches long. The horn of the white rhinoceros is slightly smaller. The horn of the Sumatran rhinoceros is about 1 to 31 inches (25 to 79 cm) in front and less than 3 inches (7 cm) in the back. The horn of the big one-horned rhinoceros is 8 to 24 inches (2 to 61 cm), and the horn of the Javanese rhinoceros is 1 inches (25 cm) long. How big is the rhinoceros According to the San Diego Zoo, the largest rhinoceros species is the white rhinoceros. It is 12 to 13 feet (3.7 to 4 meters) long from hoof to shoulder and 6 feet (1.8 meters) long from hoof to shoulder. It weighs about 5 pounds (23 kilograms).

The smallest rhinoceros species is Sumatran rhinoceros. It grows from hoof to shoulder to 8 to 1 feet (2.5 to 3 meters) and 4.8 feet (1.5 meters). Sumatran rhinoceros weighs about 1765 pounds (8 kilograms). Habitat

White rhinoceros and black rhinoceros live in grasslands and floodplains in East and South Africa. One-horned rhinoceros can be found in swamps and rainforests in northern India and southern Nepal. Sumatran rhinoceros and Javanese rhinoceros are only found in a small part of swamps and rainforests in Malaysia and Indonesia.

rhinos eat grass day and night, and only sleep during the hottest days. When they seldom don't eat, they can be found enjoying a cool mud soak. These soaks also help protect animals from insects. According to National Geographic magazine, soil is a natural sunscreen.

although rhinos are usually lonely, they occasionally form groups. The so-called car crash, these groups are composed of a woman and her descendants. Dominant men rule a piece of land. The male will allow some inferior males to live in his territory. Females roam freely in several different areas. Diet

Rhinos are herbivores, which means they only eat plants. The type of vegetation they eat varies from species to species. According to National Geographic, this is because their noses have different shapes and can accommodate different kinds of food. For example, a black rhinoceros eats trees or shrubs because its long lips allow it to pick leaves and fruits from high places. The white rhinoceros has a flat nose, which allows it to graze near the ground. Offspring

Every two and a half to five years, a female rhinoceros will breed. The gestation period of a female rhinoceros carrying a young rhinoceros is 15 to 16 months. They usually have only one child at a time, although they sometimes have twins. At birth, baby rhinos, known as baby rhinos, are still very big. According to the data of the San Diego Zoo, they weigh between 88 and 14 pounds (4 and 64 kilograms).

at the age of 3, the baby rhinoceros will set out by itself. Rhinoceroses can live for 45 years. According to the classification/classification

of the Integrated Classification Information System (ITIS), the classification of rhinoceros is:

Kingdom: Animal Subkingdom: Diptera Subkingdom: Gastropoda: Chordata Subkingdom: Vertebrate Subphyla: Palaeonopoda: Tetrapoda: Mammalia: Larynga: Euclid: Rhinodactylidae: Rhinopodidae, Eupolyphaga. The World Conservation Union lists these as cherry subspecies. Sumatran rhinoceros: Sumatran hairy rhinoceros (also known as hairy rhinoceros and Asian double-horned rhinoceros). Subspecies: Sumatra black rhinoceros, Sumatra black rhinoceros, Sumatra black rhinoceros: black rhinoceros. Subspecies: Sumatra black rhinoceros, Sumatra black rhinoceros, Sumatra black rhinoceros, Sumatra black rhinoceros, Diceros bicornis minor, Diceros bicornis occidentalis Javanese rhinoceros: Rhinoceros unicornis sondaicus rhinoceros (also known as Indian rhinoceros). Subspecies: Tricholoma matsutake rhinoceros, Tricholoma matsutake rhinoceros, Tricholoma matsutake rhinoceros and other facts: less than 25 Sumatran rhinoceros (Sumatran grouper rhinoceros) remain in the wild. (Rhino International)

Although rhinos don't often stay with each other, they do stay with birds. Cattle-pecking birds will sit on the rhinoceros' back and eat the worms crawling on the rhinoceros' skin. This is not the only advantage of this bird. When danger comes, the bird will bark to warn the rhinoceros. When the rhinoceros is happy,

will make a "mmwonk" sound with its mouth. According to the International rhino Foundation,

black rhinos are not black. According to Save the rhino, they may have this name because they like to roll in dark and muddy soil, or to distinguish them from white rhinos.

poachers also value rhinoceros horn to make decorative dagger handles, which are called jambiyas. In 197s and 198s, driven by the oil boom, this kind of handle became a status symbol of Yemen, when more people could afford luxury goods. Jambiyas can be made of precious metals, cowhide or plastic, but those made of rhinoceros horn are considered as "Rolex" versions. According to Save the Rhinoceros, in recent years, the use of rhinoceros horns has reduced the incidence of poaching.

the hairy rhinoceros became extinct about 1 years ago. According to the International Rhino Foundation, fossils have been found all over Europe and Asia. As early as 3, years ago, humans began to hunt these animals and depicted them in paintings on the walls of French caves. Additional resources international rhinoceros foundation saves rhinoceros.