Crocodiles are widely distributed in tropical and subtropical rivers and oceans. Some people may ask: don't crocodiles live in rivers? How can it be counted as a marine animal? In fact, the ancestors of modern crocodiles did live in the ocean. In order to maintain the physiological balance of salt in the body, they constantly excrete excess salt from the body through the salt glands under the eyes. This is "crocodile tears" Until now, all crocodiles still have salt glands. So crocodiles are animals from the ocean.

In the waters of South Asia, Southeast Asia and northern Australia, there is a saltwater crocodile. This saltwater crocodile may be the largest crocodile in the world. They always live in the estuaries of rivers and shallow coastal areas. Mangrove coast is where saltwater crocodiles live. When saltwater crocodiles swim in the sea for food, they often swim a long distance. Saltwater crocodiles have a wide range of food. Their menu includes all kinds of fish, crustaceans, birds and mammals. Like Nile crocodiles, they often lurk underwater in droves, waiting for an opportunity to attack livestock drinking water by the river. The attack was completed in an instant. The crocodile suddenly jumped up, grabbed its prey with its jaws and dragged it into the water. Then, the crocodile swarmed and ate it separately. In fact, crocodiles don't have a big appetite, and they are full after only a few bites at a time. In addition, the crocodile's body surface is protected by a hard and thick layer of horny scales. This can greatly reduce the heat lost by crocodiles. So every time after eating, crocodiles can lie quietly on the beach and sunbathe for two weeks without eating.

It takes 10 to 15 years for young crocodiles to get married. Female crocodiles can lay about 70 eggs at a time. Crocodiles will also have the warmth of their mothers. They always take good care of their offspring.