Unlike their manatee cousins, dugongs have a fluked tail (shaped like a dolphin’s tail) that helps them swim efficiently through the water!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Some deep-sea jellyfish have red stomachs because red appears black in deep water, helping to hide any glowing prey they’ve eaten!
Jellyfish move by pulsing their bell-shaped bodies to push water behind them, allowing them to travel about 5 miles per hour (8 km/h)!
Mother sharks don’t stay with their babies after birth, but they choose safe places called shark nurseries to give birth.
An Orca’s tail is strong enough to lift their entire body out of the water when they breach!