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Rhinoceros (scientific name: Dicerorhinus) is the general name of rhinoceros, belonging to 4 genera and 5 species. It is the largest Chiroptera in the world. Rhinoceros has short and clumsy legs, with a body length of 2.2-4.5m, a shoulder height of1.2-2m and a weight of 2,000-5,000kg. The front and rear limbs are all three toes; The skin is thick and rough, arranged in folds on the shoulders and waist, and the coat is sparse and hard, even most of it is hairless; The ears are oval, the head is big and long, the neck is short and thick, and the long lips extend; The head has solid single or double horns (some females have no horns), which originated from the dermis and can still be revived after the horns fall off; No canine teeth; The tail is thin and short, and the body is tan, brown, black or gray.

Habitat in lowlands or highlands above 2000 meters above sea level. Be active at night, live alone or form small groups. The living area never leaves the water source. Feeding habits vary from species to species, mainly grasses, or leaves, shoots, wild fruits, lichens and so on. The gestation period of female animals is 18- 19 months. Life span is 30-50 years. Because of the decorative and medicinal value of rhinoceros horn, it is caught in large quantities, and all of them are endangered species except white rhinoceros. Distributed in South Asia, Southeast Asia and sub-Saharan Africa.

September 22nd is World Rhino Day. In 20 10, "World Rhino Day" was founded by WWF South Africa Branch and has been widely accepted all over the world. The purpose of this activity is to pay attention to the rare animals in the world appearing in Oligocene, which is the largest land mammal in history-giant rhinoceros, with a strong and tall body, about 8 meters long and 5 meters tall. However, although giant rhinoceros and rhinoceros belong to Chiroptera, they are not rhinoceros.

In the late Miocene, the ancestors of the one-horned rhinoceros appeared. One-horned rhinoceros exists only in Java rhinoceros and Indian rhinoceros, both of which are distributed in Asia. The size of rhinoceros after Miocene is close to that of modern rhinoceros. Among them, the lower lip is slightly larger than the upper lip, and the lower jaw has two big teeth protruding forward. It lives in a swamp and feeds on plants in the water.

In the late Pliocene (about 3 million years ago), a two-horned rhinoceros appeared. Double-horned rhinoceros includes Sumatran rhinoceros, white rhinoceros and black rhinoceros. Humans appeared in the Quaternary period, and the early rhinoceroses were represented by rhinoceros with plate teeth and rhinoceros with fur. The blunt-topped rhinoceros is a huge individual, 5 meters long, covered with thick armor, with a big horn on its forehead, about 2 meters long, and teeth with a high crown and a square column shape. It lives on the grassland. During the Pleistocene, blunt-topped rhinoceros lived in North China and Europe of China. Hairy rhinoceros and mammoth are similar in appearance, huge in body, thick in skin and thick in hair, and can resist the cold. There are a pair of huge horns on the long nose, the longest in front can reach 1 meter, and it lives in cold areas. These two kinds of rhinoceros have been extinct at different times.