Dolphins have been observed using tools, like wearing sponges on their snouts to protect them while hunting on rocky sea floors!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Great White Sharks have such good hearing that they can detect a fish swimming from hundreds of feet away!
Some nudibranchs can kind of ‘wear’ the colours of what they eat — their food gives them pigments, so they may look different if they snack on one coral vs. another!
The deepest living starfish have been found at depths of 20,000 feet (6,000 meters) — that’s deeper than 65 football fields stacked on top of each other!
Dugongs have lived in Earth’s oceans for over 50 million years, surviving many changes in climate and sea levels!