Aquatic Animals Information: Lesson for Kids

An error occurred trying to load this video.

Try refreshing the page, or contact customer support.

Coming up next: Border Collie Facts: Lesson for Kids

You're on a roll. Keep up the good work!

Take Quiz Watch Next Lesson
Your next lesson will play in 10 seconds
  • 0:00 Aquatic Animals
  • 0:48 Fish & Mammals
  • 2:14 Mollusks, Cnidarian &…
  • 3:38 Lesson Summary
Add to Add to Add to

Want to watch this again later?

Log in or sign up to add this lesson to a Custom Course.

Login or Sign up


Recommended Lessons and Courses for You

Lesson Transcript
Instructor: Kathryn Miedema Dominguez

Kathryn has taught elementary students for over ten years and has her master's degree in elementary education.

Aquatic animals live in water. There are various types of aquatic animals that each have their own specific characteristics. In this lesson, we'll learn about fish, aquatic mammals, mollusks, cnidarians, and crustaceans.

Aquatic Animals

Do you know why Sponge Bob Square Pants is a sponge? He is a sponge because one aquatic animal is called a sea sponge. However, sea sponges do not look like a square kitchen sponge, but have a more rounded shape. Aquatic animals are animals that live in the water. They either live in fresh water, such as lakes, rivers, and ponds, or salt water, like the ocean.

Most people only think of fish when asked about aquatic animals. However, there are other groups of animals that live in the water, such as mammals (like whales), mollusks (such as sea snails), cnidarians (also known as jellyfish), and crustaceans (like crabs).

Fish & Mammals

Did you know that there are more different types of fish than the amount of amphibians, birds, mammals, and reptiles combined? Fish are aquatic animals because they live all of their lives in water. Fish are cold-blooded, and they have gills that take in oxygen from the water to breathe. In addition, fish are vertebrates, which means that they have a backbone. Think about your back and the column of vertebrae, or disks in the back, that run down the center. Fish have the same structure. While most fish can live in only freshwater or saltwater, some fish, such as salmon, live in both.

While fish only live in water, mammals can be found on land and in water. All mammals are vertebrates; have lungs; give birth to live babies, as opposed to laying eggs; and are warm-blooded. However, aquatic mammals depend on water to live. Some mammals, such as whales and dolphins, live only in water. Others, however, such as beavers and seals, will exit the water for periods of time. Because they have lungs and not gills, aquatic mammals cannot breathe underwater. Rather, they have to come to the surface to get air. If you have ever seen what looks like a spout of water coming out of a whale's blowhole, this is the whale exhaling and then inhaling before he dives back under.

To unlock this lesson you must be a Member.
Create your account

Register to view this lesson

Are you a student or a teacher?

Unlock Your Education

See for yourself why 30 million people use

Become a member and start learning now.
Become a Member  Back
What teachers are saying about
Try it risk-free for 30 days

Earning College Credit

Did you know… We have over 160 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.

Create an account to start this course today
Try it risk-free for 30 days!
Create An Account