Interesting Starfish Facts and Information for Kids

Facts and Information About Starfish for Kids

The ocean is a treasure trove of remarkable creatures, and starfish are no exception. Starfish have always fascinated children and adults for their unique appearance and intriguing behaviours. Starfish are also called sea stars, and no doubt, they are one of the most beautiful creatures found in the ocean. You would be surprised to know that starfish are not actually fish. They belong to a group of animals known as echinoderms, which also include sea urchins and sand dollars. Let’s dive into the captivating world of starfish and uncover some fun and educational starfish facts for kids.

16 Interesting Facts About Starfish for Children

If you have wondered what these wonderful creatures are and how they live, let’s embark on an exciting journey to discover the enchanting world of starfish and collect unique and rare starfish information for kids. Here are 16 sea star facts that you need to know:

1. Starfish Are Not Fish

Starfish are not really fish. They are echinoderms. The echinoderms usually have five arms. These marine invertebrates are more closely related to sea urchins, sea cucumbers, and sand dollars.

2. They Are Invertebrates

Unlike real fish, which are vertebrates with a backbone and a skeleton, starfish are invertebrates; they do not have a true internal skeleton. They do have ‘ossicles’ which are calcium carbonate plates that take on the role of an endoskeleton and form spines and granules to offer structural rigidity to them.

3. Starfish Do Not Have a Brain

Starfish do not have a brain. They do have a system of nerves and nerve plexus below their skin that perform the function of a nervous system. They are perceptive to touch, light, and temperature.

4. Some Starfish Can Have As Many As 50 Arms

Most starfish have spiny skin and 5 arms, but some of the specials can have up to 50 arms.

5. Starfish Cannot Survive in Freshwater

There are over 2,000 different species of starfish, and they are all marine. They cannot be found in freshwater lakes or rivers.

6. They Do Not Have Blood

Starfish do not have a circulatory system to transport nutrients and waste throughout the body. Instead, they use circulating seawater through their vascular system.

Starfish facts

7. They Move Using Their Tube Feet

Starfish use tube feet located on their underside to move. The tubes get filled with seawater, and the muscles in the tube feet manipulate it to extend or contract.

8. Most Starfish Are Carnivores

Most starfish are carnivores, and they have specialised body parts to feed on other organisms, such as clams, mussels, and even injured fish. Most of them have an unusual ability to consume their prey outside the body by pushing their stomachs out of their mouth over the prey and then withdrawing it to digest the food. Some species are omnivores and eat plant matter along with the animals. Some of them are also detritivores; they eat decomposing plant and animal matter at the bottom of the ocean.

9. Starfish Have Eyespots

Like most other marine invertebrates of its kind, starfish do not have eyes. They do have tiny eyespots on the tips of their arms, which allow them to tell the difference between dark and bright. They use these eyespots to detect moving objects, such as prey and potential threats.

10. They Have an Incredible Ability to Regenerate

One of the most impressive things starfish can do is to regenerate their whole body. For instance, if a predator eats almost the whole of the starfish except one arm, that arm can, over a period of time, regenerate the whole body. The process is slow and could take up to a year if it is not attacked or killed again. If the starfish is cut in half, it will grow into two different starfish!

11. They Can Change Their Gender When Needed

Although starfish are distinctly male and female (they are not hermaphrodites), environmental conditions can prompt them to change their gender in their lifetime. They also use regeneration as a method of asexual reproduction.

12. Some Starfish Have a Lifespan of 35 Years

The lifespan of starfish depends on the species. The smaller ones, weighing as little as 2 grams, can live up to 10 years. Some bigger ones take five years to reach maturity and can live for as long as 35 years.

13. Starfish Aren’t Social Creatures

Yes, they like to be alone. Starfish are solitary and prefer spending time alone. However, when they have to feed, they prefer hanging out in large groups.

14. Their Size Varies

Starfish, depending on the species, can range between the sizes of 1 cm and 65 cm. The biggest starfish species, called the sunflower starfish, can grow up to over 90 cm and weigh as much as 5 kg!

15. Some Starfish Can Be Kept as Pets

One of the fun facts about starfish is that several species of starfish can be introduced into marine aquariums that have regulated temperature and salinity as they are sensitive to both parameters. They usually feed off the plant, animal and bacterial matter on the aquarium floor and keep the water clean. So they function both as pets and water filters!

16. Not All Starfish Have Star-like Shapes

Yes, it’s true – not all starfish have a star-like shape. Some unique starfish are round in shape, even though their internal structure is similar to a star-shaped starfish.


1. What are the different types of starfish?

There are several types of starfish that are absolutely fascinating. Here are some names of different types of starfish:

  • Blue starfish
  • Horned starfish
  • Common starfish
  • Carpet starfish
  • Ochre starfish
  • Chocolate chip starfish
  • Eleven-armed starfish
  • Comb starfish
  • Pink starfish

2. What do you call a baby starfish?

The baby of the starfish is called a baby starfish or a baby sea star.

3. How many starfish are there in the world?

You won’t believe us, but there are around 2,000 species of sea stars in the world. Isn’t that so cool?

We hope these starfish facts for preschoolers and big kids fascinated you!

Starfish are fascinating marine creatures. They are found in almost all the oceans of the world. Their strange abilities have allowed them to adapt and live in the ocean for a long time. We hope you like these facts and information about starfish. Read them to your kids, they will love knowing about starfish for sure.

Also Read:

Blue Whale Facts for Kids
Fun & Amazing Animal Facts for Children
Educative Aquatic Animals Information for Kids

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