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Door On-off after delivery Further Reading Intorduction of Crocodile Crocodile is a cold-blooded oviparous animal. Crocodiles are extremely precious animals. The crocodile is not a fish, it is a reptile, the name of a crocodile, or because it plays like a fish in the water, hence the name...
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Intorduction of Crocodile
Crocodile is a cold-blooded oviparous animal. Crocodiles are extremely precious animals. The crocodile is not a fish, it is a reptile, the name of a crocodile, or because it plays like a fish in the water, hence the name "crocodile".
The crocodile is one of the earliest and most primitive animals found to be alive so far. It appeared in the Mesozoic (about 200 million years ago) of the Triassic to Cretaceous, a fierce vertebrates of vertebrate reptiles. It is a contemporaneous animal with dinosaurs and is a carnivorous animal. It is recognized that there are 23 species of crocodiles. The crocodile species domesticated and domesticated in China are: Chinese alligator, Siamese crocodile, Crocodile, Nile crocodile; there are three types of crocodiles allowed by the state: Siamese crocodile, Crocodile, Nile crocodile. Among them, Siamese crocodile (also known as Thai crocodile) is widely cultivated in the north of China. The unit that issues the crocodile domestication and breeding certificate is: State Forestry Administration.
Crocodiles are wild animals with high ecological value, scientific value and economic value. Therefore, some countries in the world are actively developing crocodile farming.
The crocodile has attracted special attention because of its position in the history of evolution: the crocodile is the last link between the existing creatures and the prehistoric dinosaur-like reptiles; at the same time, a large number of various crocodile fossils have been discovered; Three of them are extinct. Based on these extensive fossil records, it is possible to establish a clear relationship between crocodiles and other vertebrates.
The late Cretaceous period was an important period in the evolutionary history of mammals, during which many populations began to differentiate to adapt to survival in different small environments. David Klaus said: "The crocodiles have become increasingly diversified since the late Cretaceous, up to 5 meters long and less than 1 meter small, to meet the needs of different living environments.
Establishing relationships between extinct species and modern flora and fauna helps to study the geographical structure of the past. In the past, fossils were found in the northern hemisphere. Before the discovery of Madagascar, there were very few fossils in the southern hemisphere and Gondwana. The early theory of species found across the continent in the southern hemisphere suggests that there is a huge "bridge" between the continents today. However, scientists believe that 165 million years ago, the African continent was first separated from the Gondwana, and the India-Pakistan subcontinent, Madagascar, South America, and Antarctica were connected for a long time, so plants and animals Can be dispersed everywhere.
In the Han Dynasty of China, there were crocodiles in the south, and there were records in the Tang and Song Dynasties. In the Book of Rites, it was called a crocodile. Later, in the Tang Dynasty, Han Yu was acquainted with the crocodile. In the Ming Dynasty, Li Shizhen classified the crocodile into the medicinal nature in the "Compendium of Materia Medica". "Scalar-crocodile-Release name: Tulong." and set the medicinal property as: "'Indications: confidant sputum' 'wet evil spirit'" undoubtedly The role of crocodiles in human life, in modern times, the value of crocodile leather to create luxury goods.