VIDEO: Crocodiles Trap Migrating Herd

Animals are used to fighting – they do it for food, for territory and for supremacy.

Even though it may seem gruesome to us, it’s the norm for them.

Kill or be killed! Eat or be eaten! That’s how things work in the wild.

After all, it’s survival of the fittest out there!

When a migrating herd tries to cross the river, dinner is on the hoof… and the crocs just have to open wide.

According to Live Science, crocodiles are large reptiles found in tropical regions of Africa, Asia, the Americas and Australia. They are members of the order Crocodilia, which also includes caimans, gharials and alligators.

There are 13 species of crocodiles, so there are many different sizes of crocodile. The smallest crocodile is the dwarf crocodile. It grows to about 5.6 feet (1.7 meters) in length and weighs 13 to 15 pounds (6 to 7 kilograms). The largest crocodile is the saltwater crocodile. The largest one ever found was 20.24 feet (6.17 m) long. They can weigh up to 2,000 pounds (907 kg).

Crocodiles are carnivores, which mean they eat only meat. In the wild, they feast on fish, birds, frogs and crustaceans. At the zoo, they eat small animals that have already been killed for them, such as rats, fish or mice. They also eat live locusts.

In the wild, crocodiles will clamp down on their prey with their massive jaws, crush it, and then they will swallow the prey whole. They do not have the capability to chew or break off small pieces of food like other animals.

To help with digestion, crocodiles swallow small stones that grind up the food in their stomachs. Thanks to their slow metabolisms, crocodiles can survive for months without food.

During the Mesozoic Era, about 100 million years ago, the Crocodilia order was one of the top animals on the food chain. Today, crocodiles are found in the tropical habitats of Africa, Asia, Australia and the Americas. They normally live near lakes, rivers, wetlands and even some saltwater regions.

One of the largest known populations of American crocodiles is found in the Dominican Republic’s at a large saltwater lake called Lago Enriquillo, according to National Geographic.

Crocodiles live in tropical climates for a reason. They are cold-blooded and cannot generate their own heat. During colder months, they hibernate or go dormant. Crocodiles will also go dormant during long periods of drought. To create a place to hibernate, they dig out a burrow in the side of river bank or lake and settle in for a long sleep.

The Cuban crocodile is one of the world’s most endangered species of crocodile. It is considered critically endangered and has a population of only about 4,000. Poaching is a constant threat to the crocodile species.

The American crocodile is also considered vulnerable by the International Union for Conservation of Nature and Natural Resources, but their populations are increasing.

When a crocodile loses a tooth, it is quickly replaced. These reptiles can go through 8,000 teeth over a lifetime.

Crocodiles don’t sweat. To keep cool, they open their mouths in a process that is called “mouth gaping,” which is a lot like panting.