Dolphins are considered “sentinel species,” which means their health tells us about the health of the ocean!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
Great White Sharks can smell a single drop of blood in 100 liters of water — that’s like finding one penny in a backyard swimming pool!
Blue whales reach full adult size at about 10 years old!
Jellyfish can survive in polluted waters where many fish and other marine animals cannot live!
An Orca’s teeth can be up to 3 inches (8 cm) long — about the length of your index finger!