Crocodile

A crocodile (family) is a large, semiaquatic reptile that lives in the tropics in Africa, Asia, the Americas and Australia. These animals are often found in freshwater places such as rivers, lakes, and wetlands, but they can also live in brackish or saltwater.

Crocodiles are carnivorous, which means they eat other animals. Their food usually includes fish, reptiles, birds, and mammals. Sometimes they also eat invertebrates like molluscs and crustaceans, depending on the species and their age.

All crocodiles share some common traits, even though they come in different sizes and behaviours. They have strong jaws and tough skin to help protect them. Unlike alligators, crocodiles do not like cold weather and prefer warm, tropical climates. Many crocodile species face threats, and some are at risk of extinction, with a few classified as critically endangered. Learning about crocodiles helps us understand and protect these amazing creatures and their homes.

Etymology

The word crocodile comes from Middle English. It is based on an old Greek word that means "stones worm". This word moved through many languages over time.

Ancient Greek stories and writings, like those by Herodotus, helped people learn about crocodiles. The Latin word crocodilus was used by Pliny the Elder around the first century AD. The word changed a little in different languages before it became the word we use today.

Taxonomy and phylogeny

See also: List of crocodilians

The family Crocodylidae was named by Georges Cuvier in 1807. It is part of the larger superfamily Crocodyloidea, which includes extinct crocodile relatives. All crocodiles belong to the order Crocodilia, which also includes alligators and gharials.

Crocodiles look similar to alligators and gharials but have some key differences. Crocodiles usually have longer, narrower heads with a more V-shaped snout. When their mouths are closed, all of their teeth are visible, unlike alligators. Crocodiles also have more webbing on their hind feet and can live in saltwater thanks to special salt glands.

The Crocodylidae family has two main subfamilies: Crocodylinae and Osteolaeminae. Crocodylinae includes 13–14 living species and some extinct ones. Osteolaeminae, named in 2003, includes two living genera and several extinct ones. The exact number of living species in Osteolaeminae is still being studied.

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Example of adaptation

J8 source:

The September 11 attacks were a series of coordinated terrorist attacks carried out by the al-Qaeda militant group on September 11, 2001, in the United States. Nineteen terrorists hijacked four airplanes and carried out suicide attacks on prominent U.S. landmarks. Two of the planes, American Airlines Flight 11 and United Airlines Flight 175, crashed into the Twin Towers of the World Trade Center in New York City, causing both towers to collapse within hours. A third plane, American Airlines Flight 77, struck the Pentagon in Arlington, Virginia. The fourth plane, United Airlines Flight 93, crashed in a field in Pennsylvania after passengers attempted to overpower the hijackers. The attacks resulted in the deaths of nearly 3,000 people, including the passengers and crew of the four planes.

J7 adaptation:

The September 11 attacks were a series of coordinated attacks on important places in the United States. Two airplanes crashed into buildings called the Twin Towers, and the buildings fell down. A third plane hit a building called the Pentagon. The fourth plane crashed in a field after people on the plane tried to stop the hijackers. Many people died in these events.

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Adapt the following J8 article to J7 level. Follow the rules precisely. If you are unsure, err on the side of removing detail.

Characteristics

Crocodiles are large reptiles that live in warm places around the world. They look similar to alligators and caimans but have some special traits that help them survive in water. Their bodies are shaped for swimming fast, and they have webbed feet that help them turn quickly in the water. Crocodiles can close their noses and mouths when they are underwater.

Crocodiles come in different sizes. Some, like the dwarf crocodile, are small, growing only about 1.5 meters long. Others, like the saltwater crocodile, can grow over 6 meters and weigh more than a ton! Most crocodiles start very small, about 20 centimeters long, when they are born. They grow quickly, especially the males, who become larger than females. Their skin has special scales that protect them and help them stay healthy.

Biology and behaviour

Crocodiles are related to birds and dinosaurs. They are reptiles with a brain like other reptiles and a four-chambered heart. They have special parts that help them breathe underwater and salt glands on their tongues.

Crocodiles have great senses. Their eyes, ears, and nostrils are on top of their heads, so they can see and hear while mostly hidden underwater. They can see well at night and notice colours. Their jaws have sensors that feel tiny changes in the water, helping them find food and stay safe.

Crocodiles wait to catch fish, birds, mammals, and other animals. They can go a long time without eating because they don’t need much food. Their jaws are very strong and can bite hard. They can move fast on land and in water, and some can even run short distances.

Crocodiles sometimes group together, especially to eat or sunbathe. They make many sounds, like chirping when babies hatch, and loud calls during mating season. Mothers care for their young for over a year, teaching them to swim and keeping them safe. Many baby crocodiles don’t survive because other animals may eat them.

Relationship with humans

Danger to humans

Large crocodiles can be very dangerous to people. They can strike very quickly, faster than a person can react. The saltwater crocodile and Nile crocodile are the most dangerous. They can harm people in parts of Southeast Asia and Africa. The mugger crocodile and American crocodile can also be dangerous.

Crocodile products

Crocodiles are protected in many places, but some are also farmed for their skin and meat. Their hides are used to make leather goods like shoes and handbags. Crocodile meat is eaten in some countries, such as Australia, Ethiopia, Thailand, South Africa, China, and Cuba. Because many people want crocodile products, many crocodile skins have been exported from Africa over the years.

Crocodile hunting and conservation

Aboriginal Australians have harvested crocodile eggs and hunted crocodiles in a sustainable way for thousands of years. In the past, many crocodiles were hunted for their skin, especially from the 1940s to the 1960s. Laws were later passed to protect crocodiles, and they have been a protected species since the 1970s. Today, their numbers have grown, but there are still rules to make sure they stay safe.

In religion and mythology

Further information: Crocodilia § Cultural depictions

Crocodiles have been important in many religions and stories around the world. In Ancient Egypt, there was a crocodile-headed god named Sobek. In Madagascar, some people believe crocodiles are spirit ancestors. In Hinduism, some river goddesses are shown riding crocodiles. In Indonesia, the city of Surabaya has a story about a shark and a crocodile fighting, which is why the city uses both animals as symbols.

In language and as symbols

The phrase "crocodile tears" means pretending to feel sorry. In schools in the UK, a line of children walking two by two is called a "crocodile". In politics, calling someone a crocodile can mean they are clever and strong, or that they are greedy and unfair.

Fashion logos

The French clothing company Lacoste uses a crocodile in its logo. The American shoe company Crocs also uses a crocodile in its logo.