While seals have visible ears, dugongs have internal ear openings that help them hear underwater!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
A bloom of jellyfish can contain thousands or even millions of individuals all floating together!
A dolphin’s eyes can move independently of each other, allowing them to look in different directions at the same time!
Jellyfish tentacles can still sting even when separated from the body or after the jellyfish has died and washed up on shore!
Some seahorses can stretch their snouts to twice their normal length to catch prey hiding in small spaces!