Also known as estuarine crocodile or saltwater crocodile, it is a crocodile that lives in the Indo Pacific region, extending from Sri Lanka, India, Bangladesh, and eastern Myanmar to the Solomon Islands and Vanuatu, and all the way to the northern coast of Australia. It is currently the largest reptile in the world, known for its fierce nature and powerful attacking abilities. He is a nocturnal hunter who can hunt almost any animal he can catch, including humans and other saltwater crocodiles. Often appearing suddenly underwater, attacking unguarded prey and dragging them into the water to devour. The nostrils and ears have active valves, indicating that they have adapted to aquatic and terrestrial life.

Also known as the American crocodile, it is a freshwater crocodile that lives in North America and is mainly distributed in rivers, swamps, and wetlands in the southeastern United States. It is one of the two largest existing crocodiles, second only to saltwater crocodiles. Large in size, adult individuals can grow up to 4 to 5 meters in length and weigh up to 450 to 1000 kilograms. Having a powerful jaw and sharp teeth, it is a top predator. Food includes fish, birds, small mammals, and other reptiles. Their skin is dark in color, usually black or dark olive, which helps them camouflage in water. The tail is strong and powerful, and is the main tool for swimming and movement.

It is an ancient and powerful reptile belonging to the crocodile order, distributed in tropical and subtropical regions around the world. It is one of the oldest surviving reptiles with strong adaptability, able to survive in both freshwater and saltwater environments. The body structure is adapted to hunting and diving, with strong jaws and sharp teeth that can easily capture and tear prey. The skin is thick and covered with bony scales, providing excellent protection. The eyes, ears, and nostrils are located at the top of the head, allowing them to observe and breathe underwater. He is an opportunist with a wide range of diets, including fish, birds, mammals, and other reptiles.

It is an ancient and powerful reptile belonging to the crocodile order. Known for its powerful jaw force and unique lifestyle habits. Usually living in tropical and subtropical waters such as rivers, swamps, and lakes. It is a top predator that feeds on fish, birds, mammals, and even other reptiles. The body structure is adapted to aquatic life, with a streamlined body and strong limbs that can move quickly in water. The skin is covered with hard scales that not only provide protection but also help regulate body temperature. The eyes, ears, and nostrils are located at the top of the head, allowing them to breathe underwater and observe their surroundings.

The American alligator, also known as the Mississippi River crocodile or the Mississippi River crocodile, is a large species of crocodile in the Western Hemisphere and the ninth largest member of the crocodile family. Male crocodiles can reach a body length of over 4 meters, while females are less than 3 meters. Juvenile crocodiles are black in color, with irregular yellow horizontal stripes on their bodies. As adults, these yellow stripes will gradually be obscured by melanin and algae. The mouth and nose of American alligators are round and wide, with 17-22 teeth on each side of the upper jaw and the same number of teeth on the lower jaw. There are a total of 18 horizontal rows of keratinized scales on the back of the body, of which 8 rows are larger; There are incomplete fins between the toes. The American alligator is mainly distributed in the southeastern United States and inhabits freshwater wetlands.

Nile crocodile is a large crocodile belonging to the family Crocodylidae in the order Crocodiles. Nile crocodiles have a large body size, ranging from olive green to coffee colored, with black spots and a mesh pattern; The fourth tooth of the lower jaw protrudes outward from the depression of the upper jaw; There are 5 anterior teeth, 13-14 maxillary teeth, and 14-5 mandibular teeth, for a total of 64-68 teeth; The tail is strong and powerful. The adult Nile crocodile weighs up to one ton. The juvenile Nile crocodile is dark yellow brown in color, with obvious horizontal stripes on its body and tail. As an adult, the color of the horizontal stripes becomes lighter.