Crustacean

What Are Crustaceans?

Crustaceans are a large group of animals that mostly live in water. Many of them have hard outer shells, which is why their name comes from a Latin word meaning "those with shells." You might know some crustaceans already, like shrimps, prawns, crabs, lobsters, and crayfish. They are part of a bigger group called arthropods, which also includes insects and spiders.

Where Do They Live?

Most crustaceans live in oceans, rivers, and lakes. But some have learned to live on land, like woodlice. They can be very tiny, smaller than a pinhead, or very big, like the Japanese spider crab, whose legs can stretch nearly 4 meters across! Crustaceans are found all over the world, from cold polar waters to warm tropical seas.

Why Are They Important?

People enjoy eating many kinds of crustaceans. Shrimp and prawns are eaten a lot around the world. Scientists who study these animals are called carcinologists. Crustaceans are also very important for other sea animals, because many smaller creatures eat them. They help keep the water world healthy and full of life.

Fun Facts About Crustaceans

Crustaceans grow by shedding their old shells. This process is called moult. They have special limbs that help them move and eat. Some crustaceans can even change their sex during their life! They come in many shapes and sizes, and scientists are still discovering new kinds every day.