Starfish don’t have blood like we do — instead, they use seawater to move nutrients through their bodies in a special system called a water vascular system!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Basic Information
Sea lions belong to a family of marine mammals called Otariidae, which includes all eared seals!
The largest verified Great White Shark ever measured was a female named “Deep Blue,” who was 20 feet (6.1 meters) long!
Basic Information
Stingrays belong to the same family as sharks, called Chondrichthyes, which means they have skeletons made of flexible cartilage instead of bone!
Some tiny seahorses make their homes inside living sponges for protection!