Great White Sharks have a special organ called a “rete mirabile” that helps keep their brain warm even in cold water!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Jellyfish have no teeth, so they dissolve their food using enzymes before absorbing the nutrients through their body!
Jellyfish blooms can sometimes last for months, with new jellyfish constantly joining the group!
The oldest known wild Orca was a female named Granny, who lived to be over 100 years old!
Some cone snails can survive in water depths from tide pools down to about 650 feet (200 meters) below the surface!