What are the types of crocodiles and what species of crocodiles are there in the world?

There are 6 main crocodile species cultivated in China: Yangtze crocodile, Siamese crocodile (Thai crocodile), Nile crocodile, Gulf crocodile, Mississippi crocodile and caiman. Among them, the Chinese alligator is endemic to China, and the others are all imported from abroad.

The crocodile is a higher reptile that breathes with its lungs, its heart is divided into four chambers, it has a bony palate on the roof of its mouth, separating the nasal cavity from the oral cavity, and its teeth are only born in the alveoli of the upper and lower jaws, and these are similar to mammals, which indicates that mammals evolved from reptiles.

Juvenile crocodiles rely on their respiratory tract to make sounds, and laser sounds are just one of them, seeking food or indicating their position to their companions, if they can vibrate and ripple in the water. Here's how it works: the laryngeal muscles of a crocodile are divided into two pairs:

One pair of dilator muscles and one pair of contractile muscles. The dilator muscles are located on either side of the glottis, with one end attached to the anterior border of the arytenoid cartilage at the glottis and the other end ending at the lateral process formed by the cricoid cartilage in the posterior larynx.

When the dilator muscle contracts, the glottis opens. Medial and perpendicular to the dilator muscles are a constrictor muscle attached to the arytenoid cartilage. One end starts at the lingual cartilage and the other end ends at the upper border of the cricoid cartilage.

When the extoretic muscle contracts, the glottis closes. The arytenoid cartilage and cricoid cartilage form the basic scaffold of the larynx.

The wide, thin vocal cords are made up of dense connective tissue that attaches to the medial arytenoid cartilage on either side of the glottis and protrudes into the laryngeal cavity. The opening and closing of the glottis during chirping is done by the reciprocal contraction of two pairs of laryngeal muscles. When airflow in the lungs to the glottis is blocked, the vocal cords vibrate and make a sound.

There are 23 species of crocodiles. Including 13 species of crocodiles, 2 species of alligators, 6 species of giant crocodiles, and 2 species of Indian fish-eating crocodiles; It is found in tropical Australia, Asia, Africa and the Americas; Habitats in rivers, lakes, wetlands, swamps, oceans and rainforests. Crocodiles are the only representatives of the continuation of the Primosaurus.

Most of the crocodile fossils in China are skulls, such as the Shandong crocodile and Xishu crocodile in the Jurassic, and the Malayan crocodile in the Tertiary period.

On different continents, there are different crocodile species. For example, in Asia, there are fish-eating crocodiles, Chinese alligators, estuarine crocodiles, etc. In Africa, there live Nile crocodiles, etc. In the Americas, there are American crocodiles, American alligators, black caimans, and Cuville dwarf caimans, among others.

There are 6 main species of Chinese alligators, Siamese crocodiles, Nile crocodiles, Gulf crocodiles, Mississippi crocodiles and caimans. Among them, the Chinese alligator is unique to China. Crocodiles are higher reptiles that breathe with their lungs and their hearts are divided into four chambers.

There is a bony palate on the roof of the mouth that separates the nasal cavity from the mouth. Its teeth are only found in the alveoli of the upper and lower jaws, and these are similar to those of mammals, indicating that mammals evolved from reptiles.

Crocodiles: Crocodiles are divided into saltwater crocodiles and freshwater crocodiles according to the waters in which they live. Saltwater crocodiles are mainly concentrated in warm and humid coastal areas, such as the American crocodile and the bay crocodile; Freshwater crocodiles mainly live in rivers, lakes and marshes, such as Chinese alligators and Mississippi river crocodiles.

According to its size, it is divided into large crocodiles and small crocodiles. The largest crocodile and the largest living reptile on Earth is the bay crocodile, with an adult male length of 5 to 6 meters, the longest individual up to 10 meters long, and a weight of more than 1 ton; The smallest crocodile is the pygmy crocodile that lives in the Atlantic coast between the Amazon and Orinoco rivers and between the two rivers, and is generally from meters to meters long, with the longest being meters. China's Chinese alligator is a small and medium-sized crocodile with a length of about 2 meters.

The crocodile is a very ancient creature, the history of this creature is long, long, the world currently found crocodile species have these 23 species, Indian fish-eating crocodile, Malayan crocodile, Orinoco crocodile, American crocodile, Cuban crocodile, Maurelei crocodile, Nile crocodile, African alligator, swamp crocodile, New Guinea crocodile, Philippine crocodile, Thai crocodile, Gulf crocodile, Australian freshwater crocodile, African dwarf crocodile, Mississippi crocodile, Chinese alligator, spectacle caiman, bottlenose caiman, Paraguayan caiman, shield crocodile, cone-barramundi, black caiman.

The types of crocodiles are: bay crocodile, Nile crocodile, Orinoco crocodile, black caiman, Ganges crocodile.

1. Bay crocodile

The bay crocodile is also known as the man-eating crocodile, the size is very large, the adult body of the bay crocodile is about 3-6 meters long, and some can even grow to more than seven meters long, weighing more than 1600 kilograms, which is four times the weight of a normal Siberian tiger.

2. Nile crocodile

The Nile crocodile is very large, second only to the bay crocodile, and is currently the second largest crocodile, it has the typical characteristics of crocodiles, such as a wide and powerful snout, a thick and strong tail, etc., so it is also the most used species when used by humans to study crocodiles. Nile crocodiles are highly adaptable and have a wide range of distributions, whether they are lakes and swamps or saltwater wetlands.

3. Orinoco crocodile preparation

Orinoco crocodiles are large crocodiles that specialize in predatory hunting at night. There are few natural predators in the area where he lives, and any animal that enters the territory of the Orinoco crocodile will become its food, such as fish, birds, and some other small mammals. In addition to this, this crocodile also has a long lifespan and can live to the end.

Seven. Ten or eighty years old.

4. Black caiman

Black caimans belong to alligators, currently mostly living in the Amazon River Basin, strong bite force and ** hunting methods, making them the overlord of the Amazon River. Black caimans hunt large fish in the water, other caimans and some land mammals, and they have few natural predators other than jaguars.

5. Ganges crocodile

The Ganges crocodile is one of the largest crocodiles in the world, with a slender body and an overall olive color, with an average body length of about 4 meters and a weight of more than 500 pounds. Some may be larger, this crocodile has sharp teeth, 106-110 teeth, a wide and thick nose, and the most prominent thing is the slender part of his entire mouth, which not only allows the Ganges crocodile to reduce resistance when swimming in the water, but also facilitates their fishing.