Each Orca has a unique dorsal fin that can be up to 6 feet (1.83 meters) tall in adult males — that’s taller than most humans!
Aquatic Animals - Facts for Kids

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Random Facts About Aquatic Animals For Kids
A male seahorse can give birth to three batches of babies in one summer!
Some sharks, like the epaulette shark, can actually walk on land for short distances using their fins!
Dolphins take turns babysitting each other’s calves while other mothers go hunting!
Blue whale calves grow faster than any other animal on Earth!