Crocodiles mostly live in rivers, lakes and watery swamps in tropical and subtropical regions, only a few live in temperate regions, and some live in shallows near the coast. It has a long face and a long mouth, and there is a saying that "the king of the world is not like a crocodile at all". Crocodiles are rich in ornamental value. Crocodiles also have many medicinal and health functions. Crocodiles are also valuable food. Because there are treasures everywhere, some countries in the world actively develop crocodile farming.
Crocodiles are 1 crocodile. Also known as Gulf Crocodile or Marine Crocodile. Distributed in Southeast Asia to the northern coast of Australia. The total length is 6-7 meters, and the longest is 10 meter, which is the largest reptile in existence. Crocodiles live on the other side of the bay or the sea. On the tree-lined hills near the Danshui River (more than 60,000 meters away from the sea), they use their tails to sweep out a platform of 7-8 meters. There is a nest for crocodile eggs on the platform with a true diameter of 3 meters. The bird's nest is about 4 meters away from the river and is made of leaves. There are about 50 white hard-shell eggs in each nest, the size is about 80×55 mm; Female crocodiles wait by the nest, always wagging their tails and watering the nest, keeping the temperature at 30 ~ 33℃ and incubating for 75 ~ 90 days; The larval body length is 240mm, 1 year can reach 480mm, and it reaches 1 156mm in three years, weighing 5.2kg ... The crocodile is fierce and unruly. Adult crocodiles are often underwater, with only their eyes and nose exposed. They have keen eyes and ears and will sink immediately when they are frightened. In the afternoon, I float in the sun, and at night, my eyes are bright. The little crocodile is red. Crocodiles mate for several hours from May to June, while fertilization only takes 1 ~ 2 minutes. Laying eggs in July and August. Male crocodiles monopolize the territory, driving away invaders, and a male leads a group of females. They often eat fish, frogs, shrimps and crabs, as well as crocodiles, turtles and turtles. Strong chewing ability, can break the hard armor. Crocodiles were first seen in China in Han Dynasty, recorded frequently in Tang and Song Dynasties, and occasionally seen in coastal islands since Ming and Qing Dynasties. As the saying goes, "crocodile tears" are actually true. Crocodiles really shed tears, but that's not because they are sad, but because they are excreting excess salt in their bodies. . The excretory function of crocodile kidney is not perfect, and the excess salt in the body depends on a special salt gland to excrete. The salt glands of crocodiles are located near the eyes. Besides crocodiles, turtles, sea snakes, sea lizards and some seabirds also have similar salt glands. Salt glands enable these animals to remove excess salt from seawater and obtain fresh water. Therefore, salt glands are their natural "seawater desalinators".