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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, a body length of 2.2-4.5m, a shoulder height of 1.2-2m and a weight of 2000-5000kg. The front and rear limbs are all three toes; The skin is thick and rough, arranged in folds at the shoulders and waist, and the coat is sparse and hard, even mostly 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 yellowish brown, brown, black or gray.

Habitat in lowlands or highlands above 2000 meters above sea level. Night activities, living alone or forming 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, except for white rhinoceros, which is an endangered species. 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 and has been widely accepted all over the world. The purpose of this activity is to pay attention to the emergence of a rare animal in the world in Oligocene, the largest land mammal in history-the giant rhinoceros, with a strong and tall body, about 8 meters long and 5 meters high. 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 only exists in Java rhinoceros and Indian rhinoceros, both of which are distributed in Asia. The rhinoceros that appeared after Miocene is close to modern rhinoceros. 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.

Two-horned rhinoceros appeared in the late Pliocene (about 3 million years ago). Double-horned rhinoceros includes Sumatran rhinoceros, white rhinoceros and black rhinoceros. Humans appeared in the Quaternary, and the early rhinoceros was represented by the plate-toothed rhinoceros and the hairy rhinoceros. Blunt-topped rhinoceros is a huge individual, with a body length of 5 meters, covered with thick armor, a big horn on his forehead, about 2 meters long, and high crowns on his teeth, which are square columns. It lives on the grassland. During the Pleistocene, blunt-topped rhinoceros lived in China, North China and Europe. Hairy rhinoceros and mammoth are similar in appearance, huge in size, 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 rhinos became extinct at different times.